SPRUIN7C March 2020 – March 2024 TMS320F280021 , TMS320F280021-Q1 , TMS320F280023 , TMS320F280023-Q1 , TMS320F280023C , TMS320F280025 , TMS320F280025-Q1 , TMS320F280025C , TMS320F280025C-Q1
The JTAG lock feature can be used to permanently disable any access to the device using the JTAG port. For example, access by the Code Composer Studio™ IDE debugger or Flash programming tools are blocked. This feature is enabled by programming the Z1OTP_JTAGLOCK location in user OTP memory with any value other than 1111 (0xF). Values of CRCLOCK, JTAGLOCK, and PSWDLOCK locations in the OTP memory are copied in the Z1_OTPSECLOCK register by the boot-ROM code.