SLAA685 December   2015 CC430F6125 , CC430F6125 , CC430F6126 , CC430F6126 , CC430F6127 , CC430F6127 , CC430F6135 , CC430F6135 , CC430F6137 , CC430F6137 , CC430F6147 , CC430F6147 , MSP430AFE221 , MSP430AFE221 , MSP430AFE222 , MSP430AFE222 , MSP430AFE223 , MSP430AFE223 , MSP430AFE231 , MSP430AFE231 , MSP430AFE232 , MSP430AFE232 , MSP430AFE233 , MSP430AFE233 , MSP430AFE251 , MSP430AFE251 , MSP430AFE252 , MSP430AFE252 , MSP430AFE253 , MSP430AFE253 , MSP430BT5190 , MSP430BT5190 , MSP430F1101 , MSP430F1101 , MSP430F1101A , MSP430F1101A , MSP430F1111A , MSP430F1111A , MSP430F112 , MSP430F112 , MSP430F1121 , MSP430F1121 , MSP430F1121A , MSP430F1121A , MSP430F1122 , MSP430F1122 , MSP430F1132 , MSP430F1132 , MSP430F122 , MSP430F122 , MSP430F1222 , MSP430F1222 , MSP430F123 , MSP430F123 , MSP430F1232 , MSP430F1232 , MSP430F133 , MSP430F133 , MSP430F135 , MSP430F135 , MSP430F147 , MSP430F147 , MSP430F1471 , MSP430F1471 , MSP430F148 , MSP430F148 , MSP430F1481 , MSP430F1481 , MSP430F149 , MSP430F149 , MSP430F1491 , MSP430F1491 , MSP430F155 , MSP430F155 , MSP430F156 , MSP430F156 , MSP430F157 , MSP430F157 , MSP430F1610 , MSP430F1610 , MSP430F1611 , MSP430F1611 , MSP430F1612 , MSP430F1612 , MSP430F167 , MSP430F167 , MSP430F168 , MSP430F168 , MSP430F169 , MSP430F169 , MSP430F2001 , MSP430F2001 , MSP430F2002 , MSP430F2002 , MSP430F2003 , MSP430F2003 , MSP430F2011 , MSP430F2011 , MSP430F2012 , MSP430F2012 , MSP430F2013 , MSP430F2013 , MSP430F2013-EP , MSP430F2013-EP , MSP430F2101 , MSP430F2101 , MSP430F2111 , MSP430F2111 , MSP430F2112 , MSP430F2112 , MSP430F2121 , MSP430F2121 , MSP430F2122 , MSP430F2122 , MSP430F2131 , MSP430F2131 , MSP430F2132 , MSP430F2132 , MSP430F2232 , MSP430F2232 , MSP430F2234 , MSP430F2234 , MSP430F2252 , MSP430F2252 , MSP430F2254 , MSP430F2254 , MSP430F2272 , MSP430F2272 , MSP430F2274 , MSP430F2274 , MSP430F233 , MSP430F233 , MSP430F2330 , MSP430F2330 , MSP430F235 , MSP430F235 , MSP430F2350 , MSP430F2350 , MSP430F2370 , MSP430F2370 , MSP430F2410 , MSP430F2410 , MSP430F2416 , MSP430F2416 , MSP430F2417 , MSP430F2417 , MSP430F2418 , MSP430F2418 , MSP430F2419 , MSP430F2419 , MSP430F247 , MSP430F247 , MSP430F2471 , MSP430F2471 , MSP430F248 , MSP430F248 , MSP430F2481 , MSP430F2481 , MSP430F249 , MSP430F249 , MSP430F2491 , MSP430F2491 , MSP430F2616 , MSP430F2616 , MSP430F2617 , MSP430F2617 , MSP430F2618 , MSP430F2618 , MSP430F2619 , MSP430F2619 , MSP430F412 , MSP430F412 , MSP430F413 , MSP430F413 , MSP430F4132 , MSP430F4132 , MSP430F415 , MSP430F415 , MSP430F4152 , MSP430F4152 , MSP430F417 , MSP430F417 , MSP430F423 , MSP430F423 , MSP430F423A , MSP430F423A , MSP430F425 , MSP430F425 , MSP430F4250 , MSP430F4250 , MSP430F425A , MSP430F425A , MSP430F4260 , MSP430F4260 , MSP430F427 , MSP430F427 , MSP430F4270 , MSP430F4270 , MSP430F427A , MSP430F427A , MSP430F435 , MSP430F435 , MSP430F4351 , MSP430F4351 , MSP430F436 , MSP430F436 , MSP430F4361 , MSP430F4361 , MSP430F437 , MSP430F437 , MSP430F4371 , MSP430F4371 , MSP430F438 , MSP430F438 , MSP430F439 , MSP430F439 , MSP430F447 , MSP430F447 , MSP430F448 , MSP430F448 , MSP430F4481 , MSP430F4481 , MSP430F449 , MSP430F449 , MSP430F4491 , MSP430F4491 , MSP430F4616 , MSP430F4616 , MSP430F46161 , MSP430F46161 , MSP430F4617 , MSP430F4617 , MSP430F46171 , MSP430F46171 , MSP430F4618 , MSP430F4618 , MSP430F46181 , MSP430F46181 , MSP430F4619 , MSP430F4619 , MSP430F46191 , MSP430F46191 , MSP430F47126 , MSP430F47126 , MSP430F47127 , MSP430F47127 , MSP430F47163 , MSP430F47163 , MSP430F47166 , MSP430F47166 , MSP430F47167 , MSP430F47167 , MSP430F47173 , MSP430F47173 , MSP430F47176 , MSP430F47176 , MSP430F47177 , MSP430F47177 , MSP430F47183 , MSP430F47183 , MSP430F47186 , MSP430F47186 , MSP430F47187 , MSP430F47187 , MSP430F47193 , MSP430F47193 , MSP430F47196 , MSP430F47196 , MSP430F47197 , MSP430F47197 , MSP430F477 , MSP430F477 , MSP430F478 , MSP430F478 , MSP430F4783 , MSP430F4783 , MSP430F4784 , MSP430F4784 , MSP430F479 , MSP430F479 , MSP430F4793 , MSP430F4793 , MSP430F4794 , MSP430F4794 , MSP430F5212 , MSP430F5212 , MSP430F5214 , MSP430F5214 , MSP430F5217 , MSP430F5217 , MSP430F5219 , MSP430F5219 , MSP430F5222 , MSP430F5222 , MSP430F5224 , MSP430F5224 , MSP430F5229 , MSP430F5229 , MSP430F5232 , MSP430F5232 , MSP430F5234 , MSP430F5234 , MSP430F5237 , MSP430F5237 , MSP430F5239 , MSP430F5239 , MSP430F5242 , MSP430F5242 , MSP430F5244 , MSP430F5244 , MSP430F5247 , MSP430F5247 , MSP430F5249 , MSP430F5249 , MSP430F5252 , MSP430F5252 , MSP430F5253 , MSP430F5253 , MSP430F5254 , MSP430F5254 , MSP430F5255 , MSP430F5255 , MSP430F5256 , MSP430F5256 , MSP430F5257 , MSP430F5257 , MSP430F5258 , MSP430F5258 , MSP430F5259 , MSP430F5259 , MSP430F5304 , MSP430F5304 , MSP430F5308 , MSP430F5308 , MSP430F5309 , MSP430F5309 , MSP430F5310 , MSP430F5310 , MSP430F5324 , MSP430F5324 , MSP430F5325 , MSP430F5325 , MSP430F5326 , MSP430F5326 , MSP430F5327 , MSP430F5327 , MSP430F5328 , MSP430F5328 , MSP430F5329 , MSP430F5329 , MSP430F5333 , MSP430F5333 , MSP430F5335 , MSP430F5335 , MSP430F5336 , MSP430F5336 , MSP430F5338 , MSP430F5338 , MSP430F5340 , MSP430F5340 , MSP430F5341 , MSP430F5341 , MSP430F5342 , MSP430F5342 , MSP430F5358 , MSP430F5358 , MSP430F5359 , MSP430F5359 , MSP430F5418 , MSP430F5418 , MSP430F5418A , MSP430F5418A , MSP430F5419 , MSP430F5419 , MSP430F5419A , MSP430F5419A , MSP430F5435 , MSP430F5435 , MSP430F5435A , MSP430F5435A , MSP430F5436 , MSP430F5436 , MSP430F5436A , MSP430F5436A , MSP430F5437 , MSP430F5437 , MSP430F5437A , MSP430F5437A , MSP430F5438 , MSP430F5438 , MSP430F5438A , MSP430F5438A , MSP430F5500 , MSP430F5500 , MSP430F5501 , MSP430F5501 , MSP430F5502 , MSP430F5502 , MSP430F5503 , MSP430F5503 , MSP430F5504 , MSP430F5504 , MSP430F5505 , MSP430F5505 , MSP430F5506 , MSP430F5506 , MSP430F5507 , MSP430F5507 , MSP430F5508 , MSP430F5508 , MSP430F5509 , MSP430F5509 , MSP430F5510 , MSP430F5510 , MSP430F5513 , MSP430F5513 , MSP430F5514 , MSP430F5514 , MSP430F5515 , MSP430F5515 , MSP430F5517 , MSP430F5517 , MSP430F5519 , MSP430F5519 , MSP430F5521 , MSP430F5521 , MSP430F5522 , MSP430F5522 , MSP430F5524 , MSP430F5524 , MSP430F5525 , MSP430F5525 , MSP430F5526 , MSP430F5526 , MSP430F5527 , MSP430F5527 , MSP430F5528 , MSP430F5528 , MSP430F5529 , MSP430F5529 , MSP430F5630 , MSP430F5630 , MSP430F5631 , MSP430F5631 , MSP430F5632 , MSP430F5632 , MSP430F5633 , MSP430F5633 , MSP430F5634 , MSP430F5634 , MSP430F5635 , MSP430F5635 , MSP430F5636 , MSP430F5636 , MSP430F5637 , MSP430F5637 , MSP430F5638 , MSP430F5638 , MSP430F5658 , MSP430F5658 , MSP430F5659 , MSP430F5659 , MSP430F6433 , MSP430F6433 , MSP430F6435 , MSP430F6435 , MSP430F6436 , MSP430F6436 , MSP430F6438 , MSP430F6438 , MSP430F6458 , MSP430F6458 , MSP430F6459 , MSP430F6459 , MSP430F6630 , MSP430F6630 , MSP430F6631 , MSP430F6631 , MSP430F6632 , MSP430F6632 , MSP430F6633 , MSP430F6633 , MSP430F6634 , MSP430F6634 , MSP430F6635 , MSP430F6635 , MSP430F6636 , MSP430F6636 , MSP430F6637 , MSP430F6637 , MSP430F6638 , MSP430F6638 , MSP430F6658 , MSP430F6658 , MSP430F6659 , MSP430F6659 , MSP430F6745 , MSP430F6745 , MSP430F67451 , MSP430F67451 , MSP430F67451A , MSP430F67451A , MSP430F6745A , MSP430F6745A , MSP430F6746 , MSP430F6746 , MSP430F67461 , MSP430F67461 , MSP430F67461A , MSP430F67461A , MSP430F6746A , MSP430F6746A , MSP430F6747 , MSP430F6747 , MSP430F67471 , MSP430F67471 , MSP430F67471A , MSP430F67471A , MSP430F6747A , MSP430F6747A , MSP430F6748 , MSP430F6748 , MSP430F67481 , MSP430F67481 , MSP430F67481A , MSP430F67481A , MSP430F6748A , MSP430F6748A , MSP430F6749 , MSP430F6749 , MSP430F67491 , MSP430F67491 , MSP430F67491A , MSP430F67491A , MSP430F6749A , MSP430F6749A , MSP430F67621 , MSP430F67621 , MSP430F67621A , MSP430F67621A , MSP430F67641 , MSP430F67641 , MSP430F67641A , MSP430F67641A , MSP430F6765 , MSP430F6765 , MSP430F67651 , MSP430F67651 , MSP430F67651A , MSP430F67651A , MSP430F6765A , MSP430F6765A , MSP430F6766 , MSP430F6766 , MSP430F67661 , MSP430F67661 , MSP430F67661A , MSP430F67661A , MSP430F6766A , MSP430F6766A , MSP430F6767 , MSP430F6767 , MSP430F67671 , MSP430F67671 , MSP430F67671A , MSP430F67671A , MSP430F6767A , MSP430F6767A , MSP430F6768 , MSP430F6768 , MSP430F67681 , MSP430F67681 , MSP430F67681A , MSP430F67681A , MSP430F6768A , MSP430F6768A , MSP430F6769 , MSP430F6769 , MSP430F67691 , MSP430F67691 , MSP430F67691A , MSP430F67691A , MSP430F6769A , MSP430F6769A , MSP430F6775 , MSP430F6775 , MSP430F67751 , MSP430F67751 , MSP430F67751A , MSP430F67751A , MSP430F6775A , MSP430F6775A , MSP430F6776 , MSP430F6776 , MSP430F67761 , MSP430F67761 , MSP430F67761A , MSP430F67761A , MSP430F6776A , MSP430F6776A , MSP430F6777 , MSP430F6777 , MSP430F67771 , MSP430F67771 , MSP430F67771A , MSP430F67771A , MSP430F6777A , MSP430F6777A , MSP430F6778 , MSP430F6778 , MSP430F67781 , MSP430F67781 , MSP430F67781A , MSP430F67781A , MSP430F6778A , MSP430F6778A , MSP430F6779 , MSP430F6779 , MSP430F67791 , MSP430F67791 , MSP430F67791A , MSP430F67791A , MSP430F6779A , MSP430F6779A , MSP430FE423 , MSP430FE423 , MSP430FE4232 , MSP430FE4232 , MSP430FE423A , MSP430FE423A , MSP430FE4242 , MSP430FE4242 , MSP430FE425 , MSP430FE425 , MSP430FE4252 , MSP430FE4252 , MSP430FE425A , MSP430FE425A , MSP430FE427 , MSP430FE427 , MSP430FE4272 , MSP430FE4272 , MSP430FE427A , MSP430FE427A , MSP430FG4250 , MSP430FG4250 , MSP430FG4260 , MSP430FG4260 , MSP430FG4270 , MSP430FG4270 , MSP430FG437 , MSP430FG437 , MSP430FG438 , MSP430FG438 , MSP430FG439 , MSP430FG439 , MSP430FG4616 , MSP430FG4616 , MSP430FG4617 , MSP430FG4617 , MSP430FG4618 , MSP430FG4618 , MSP430FG4619 , MSP430FG4619 , MSP430FG477 , MSP430FG477 , MSP430FG478 , MSP430FG478 , MSP430FG479 , MSP430FG479 , MSP430FR2032 , MSP430FR2032 , MSP430FR2033 , MSP430FR2033 , MSP430FR2110 , MSP430FR2110 , MSP430FR2111 , MSP430FR2111 , MSP430FR2311 , MSP430FR2311 , MSP430FR2433 , MSP430FR2433 , MSP430FR2532 , MSP430FR2532 , MSP430FR2533 , MSP430FR2533 , MSP430FR2632 , MSP430FR2632 , MSP430FR2633 , MSP430FR2633 , MSP430FR4131 , MSP430FR4131 , MSP430FR4132 , MSP430FR4132 , MSP430FR5720 , MSP430FR5720 , MSP430FR5721 , MSP430FR5721 , MSP430FR5722 , MSP430FR5722 , MSP430FR5723 , MSP430FR5723 , MSP430FR5724 , MSP430FR5724 , MSP430FR5725 , MSP430FR5725 , MSP430FR5726 , MSP430FR5726 , MSP430FR5727 , MSP430FR5727 , MSP430FR5728 , MSP430FR5728 , MSP430FR5729 , MSP430FR5729 , MSP430FR5730 , MSP430FR5730 , MSP430FR5731 , MSP430FR5731 , MSP430FR5732 , MSP430FR5732 , MSP430FR5733 , MSP430FR5733 , MSP430FR5734 , MSP430FR5734 , MSP430FR5735 , MSP430FR5735 , MSP430FR5736 , MSP430FR5736 , MSP430FR5737 , MSP430FR5737 , MSP430FR5738 , MSP430FR5738 , MSP430FR5739 , MSP430FR5739 , MSP430FR5847 , MSP430FR5847 , MSP430FR58471 , MSP430FR58471 , MSP430FR5848 , MSP430FR5848 , MSP430FR5849 , MSP430FR5849 , MSP430FR5857 , MSP430FR5857 , MSP430FR5858 , MSP430FR5858 , MSP430FR5859 , MSP430FR5859 , MSP430FR5867 , MSP430FR5867 , MSP430FR58671 , MSP430FR58671 , MSP430FR5868 , MSP430FR5868 , MSP430FR5869 , MSP430FR5869 , MSP430FR5870 , MSP430FR5870 , MSP430FR5872 , MSP430FR5872 , MSP430FR58721 , MSP430FR58721 , MSP430FR5887 , MSP430FR5887 , MSP430FR5888 , MSP430FR5888 , MSP430FR5889 , MSP430FR5889 , MSP430FR58891 , MSP430FR58891 , MSP430FR5922 , MSP430FR5922 , MSP430FR59221 , MSP430FR59221 , MSP430FR5947 , MSP430FR5947 , MSP430FR59471 , MSP430FR59471 , MSP430FR5948 , MSP430FR5948 , MSP430FR5949 , MSP430FR5949 , MSP430FR5957 , MSP430FR5957 , MSP430FR5958 , MSP430FR5958 , MSP430FR5959 , MSP430FR5959 , MSP430FR5967 , MSP430FR5967 , MSP430FR5968 , MSP430FR5968 , MSP430FR5969 , MSP430FR5969 , MSP430FR5969-SP , MSP430FR5969-SP , MSP430FR59691 , MSP430FR59691 , MSP430FR5970 , MSP430FR5970 , MSP430FR5972 , MSP430FR5972 , MSP430FR59721 , MSP430FR59721 , MSP430FR5986 , MSP430FR5986 , MSP430FR5987 , MSP430FR5987 , MSP430FR5988 , MSP430FR5988 , MSP430FR5989 , MSP430FR5989 , MSP430FR5989-EP , MSP430FR5989-EP , MSP430FR59891 , MSP430FR59891 , MSP430FR5994 , MSP430FR5994 , MSP430FR6820 , MSP430FR6820 , MSP430FR6822 , MSP430FR6822 , MSP430FR68221 , MSP430FR68221 , MSP430FR6870 , MSP430FR6870 , MSP430FR6872 , MSP430FR6872 , MSP430FR68721 , MSP430FR68721 , MSP430FR6877 , MSP430FR6877 , MSP430FR6879 , MSP430FR6879 , MSP430FR68791 , MSP430FR68791 , MSP430FR6887 , MSP430FR6887 , MSP430FR6888 , MSP430FR6888 , MSP430FR6889 , MSP430FR6889 , MSP430FR68891 , MSP430FR68891 , MSP430FR6920 , MSP430FR6920 , MSP430FR6922 , MSP430FR6922 , MSP430FR69221 , MSP430FR69221 , MSP430FR6927 , MSP430FR6927 , MSP430FR69271 , MSP430FR69271 , MSP430FR6928 , MSP430FR6928 , MSP430FR6970 , MSP430FR6970 , MSP430FR6972 , MSP430FR6972 , MSP430FR69721 , MSP430FR69721 , MSP430FR6977 , MSP430FR6977 , MSP430FR6979 , MSP430FR6979 , MSP430FR69791 , MSP430FR69791 , MSP430FR6987 , MSP430FR6987 , MSP430FR6988 , MSP430FR6988 , MSP430FR6989 , MSP430FR6989 , MSP430FR69891 , MSP430FR69891 , MSP430FW423 , MSP430FW423 , MSP430FW425 , MSP430FW425 , MSP430FW427 , MSP430FW427 , MSP430FW428 , MSP430FW428 , MSP430FW429 , MSP430FW429 , MSP430G2001 , MSP430G2001 , MSP430G2101 , MSP430G2101 , MSP430G2102 , MSP430G2102 , MSP430G2111 , MSP430G2111 , MSP430G2112 , MSP430G2112 , MSP430G2121 , MSP430G2121 , MSP430G2131 , MSP430G2131 , MSP430G2132 , MSP430G2132 , MSP430G2152 , MSP430G2152 , MSP430G2153 , MSP430G2153 , MSP430G2201 , MSP430G2201 , MSP430G2202 , MSP430G2202 , MSP430G2203 , MSP430G2203 , MSP430G2210 , MSP430G2210 , MSP430G2211 , MSP430G2211 , MSP430G2212 , MSP430G2212 , MSP430G2213 , MSP430G2213 , MSP430G2221 , MSP430G2221 , MSP430G2230 , MSP430G2230 , MSP430G2231 , MSP430G2231 , MSP430G2232 , MSP430G2232 , MSP430G2233 , MSP430G2233 , MSP430G2252 , MSP430G2252 , MSP430G2253 , MSP430G2253 , MSP430G2302 , MSP430G2302 , MSP430G2303 , MSP430G2303 , MSP430G2312 , MSP430G2312 , MSP430G2313 , MSP430G2313 , MSP430G2332 , MSP430G2332 , MSP430G2333 , MSP430G2333 , MSP430G2352 , MSP430G2352 , MSP430G2353 , MSP430G2353 , MSP430G2402 , MSP430G2402 , MSP430G2403 , MSP430G2403 , MSP430G2412 , MSP430G2412 , MSP430G2413 , MSP430G2413 , MSP430G2432 , MSP430G2432 , MSP430G2433 , MSP430G2433 , MSP430G2444 , MSP430G2444 , MSP430G2452 , MSP430G2452 , MSP430G2453 , MSP430G2453 , MSP430G2513 , MSP430G2513 , MSP430G2533 , MSP430G2533 , MSP430G2544 , MSP430G2544 , MSP430G2553 , MSP430G2553 , MSP430G2744 , MSP430G2744 , MSP430G2755 , MSP430G2755 , MSP430G2855 , MSP430G2855 , MSP430G2955 , MSP430G2955 , MSP430L092 , MSP430L092 , MSP430TCH5E , MSP430TCH5E

 

  1.   MSP Code Protection Features
    1.     Trademarks
    2. 1 Introduction
    3. 2 Locking JTAG Across Different MSP Families
      1. 2.1 Physical JTAG Fuse (F1xx/F2xx/F4xx)
      2. 2.2 Electronic Fuse or Lock Without Password
        1. 2.2.1 F5xx/F6xx Electronic Fuse Implementation
        2. 2.2.2 FR5xx/FR6xx Electronic Fuse Implementation (Lock without password)
        3. 2.2.3 FR2xx/FR4xx Electronic Fuse Implementation
        4. 2.2.4 MSP430i2xx Electronic Fuse Implementation – Start-Up Code (SUC)
      3. 2.3 JTAG Lock With Password (FR5xx/FR6xx)
        1. 2.3.1 Using JTAG Lock With Password in CCS
        2. 2.3.2 Using JTAG Lock With Password in IAR
    4. 3 IP Encapsulation (IPE)
      1. 3.1 IP Encapsulation Using the IPE Tool in CCS
        1. 3.1.1 CCS Linker File Features for IPE
        2. 3.1.2 Placing Code and Data in the IPE Sections in CCS
        3. 3.1.3 Enabling IPE in CCS Project Options
        4. 3.1.4 Viewing the Compiler-Selected IPE partitioning in CCS
        5. 3.1.5 Running and Testing IPE Code in CCS
          1. 3.1.5.1 Debug Settings With IPE in CCS
          2. 3.1.5.2 Testing IPE in CCS
      2. 3.2 IP Encapsulation Using the IPE Tool in IAR
        1. 3.2.1 IAR Linker File Features for IPE
        2. 3.2.2 Placing Code and Data in the IPE Sections in IAR
        3. 3.2.3 Enabling IPE in IAR Project Options
        4. 3.2.4 Viewing the Compiler-Selected IPE Partitioning in IAR
        5. 3.2.5 Running and Testing IPE Code in IAR
          1. 3.2.5.1 Debug Settings With IPE in IAR
          2. 3.2.5.2 Testing IPE in IAR
    5. 4 Bootloader (BSL) Security Features
      1. 4.1 Password Protection
      2. 4.2 Mass Erase on Incorrect Password
      3. 4.3 Disabling Bootloader (BSL)
    6. 5 References

2.2.4 MSP430i2xx Electronic Fuse Implementation – Start-Up Code (SUC)

On MSP430i2xx devices, the JTAG/SBW device security is controlled by the Start-Up Code (SUC). The SUC must set the device as secured or unsecured within the first 64 MCLK clock cycles after a BOR or POR reset. The SUC determines if JTAG/SBW access should be enabled or disabled by checking the signatures at addresses 0xFFDC-0xFFDF.

The JTAG/SBW interface is disabled by writing the addresses FFDCh–FFDFh with any value other than 00000000h or FFFFFFFFh. The SUC checks the value in these addresses after a POR or BOR reset. If the value is different from 00000000h or FFFFFFFFh, then the SUC writes A5A5h into the SYSJTAGDIS register to disable the JTAG/SBW interface and secure the device. The SUC must complete this within 64 MCLK cycles after the BOR or POR reset.

Because the MSP430i2xx device does not have a bootloader, it is not possible to clear the addresses 0xFFDC-0xFFDF to re-enable JTAG/SBW access. If the user has implemented a custom bootloader in main memory, they can use this to write the addresses FFDCh–FFDFh to 00000000h. The SUC checks the value in these addresses after a POR or BOR reset. If the value is 00000000h or FFFFFFFFh, then the SUC does nothing and continues on to the calibration routine—after 64 MCLK cycles, the JTAG is enabled the device is unsecured automatically.

See the MSP430i2xx Family User's Guide (SLAU335) and the device code examples for more information about the SUC.

Table 5. JTAG Locking on i2xx

Name Addresses Value Device Security
JTAG/SBW Signature FFDCh–FFDFh FFFF_FFFFh JTAG/SBW is unlocked.(1)
0000_0000h
Any other value JTAG/SBW is locked.(1)
(1) The correct SUC code must be implemented to check these addresses and perform the locking or unlocking within 64 cycles of MCLK after start-up. Use the SUC code included with the i2xx code examples, which already has this implemented.