1. See
Table 3 for value of Rd.
Figure 2. On-Chip Oscillator Circuit
Figure 3. Divide-by-Two Mode
EXTCLK is held low.
Figure 4. Divide-by-One Mode
This figure shows output load characteristics for high-speed and low-speed (low-noise) output buffers. High-speed buffers are used on A0 to A23, PAGE0 to PAGE3, H1, H3, STRB, and R/W. All other outputs use the low-speed, (low-noise) output buffer.
CLmax = 30 pF
Figure 5. Output Load Characteristics, Buffer Only
STRB remains low during back-to-back read operations.
Figure 6. Timing for Memory (STRB = 0 and PAGEx = 0) Read
Figure 7. Timing for Memory (STRB = 0 and PAGEx = 0) Write
Figure 8. Timing for XF0 and XF1 When Executing LDFI or LDII
Figure 9. Timing for XF0 When Executing an STFI or STII
Figure 10. Timing for XF0 and XF1 When Executing SIGI
- OUTXFx represents either bit 2 or 6 of the IOF register
.
Figure 11. Timing for Loading XF Register When Configured as an Output Pin
- I/OxFx represents either bit 1 or bit 5 of the IOF register, and INXFx represents either bit 3 or bit 7 of the IOF register.
Figure 12. Timing for Changing XFx from Output to Input Mode
- I/OxFx represents either bit 1 or bit 5 of the IOF register.
Figure 13. Timing for Changing XFx from Input to Output Mode
- Clock circuit is configured in C31-compatible divide-by-2 mode. If configured for x1 mode, EXTCLK directly drives H3.
- Asynchronous reset signals include XF0/1, CLKX0, DX0, FSX0, CLKR0, DR0, FSR0, and TCLK0/1.
-
RESET is a synchronous input that can be asserted at any point during a clock cycle. If the specified timings are met, the exact sequence shown occurs; otherwise, an additional delay of one clock cycle is possible.
In microprocessor mode, the reset vector is fetched twice, with seven software wait states each time. In microcomputer mode, the reset vector is fetched twice, with no software wait states.
The address and PAGE3 to PAGE0 outputs are placed in a high-impedance state during reset requiring a nominal 10- to 22-kΩ pullup. If not, undesirable spurious reads can occur when these outputs are not driven.
Figure 14. RESET Timing
- Falling edge of H1 just detects INTx falling edge.
- Falling edge of H1 detects second INTx low, however flag clear takes precedence.
- Nominal width
- Falling edge of H1 misses previous INTx low as INTx rises.
Figure 15. INT3 to INT0 Response Timing
Figure 16. Interrupt Acknowledge (IACK) Timing
HOLDA goes low in response to HOLD going low and continues to remain low until one H1 cycle after HOLD goes back high.
Figure 17. Timing for HOLD/HOLDA (After Write)
HOLDA goes low in response to HOLD going low and continues to remain low until one H1 cycle after HOLD goes back high.
Figure 18. Timing for HOLD/HOLDA (After Read)
- Peripheral pins include CLKX0, CLKR0, DX0, DR0, FSX0, FSR0, and TCLK0/1.
Figure 19. Change of Peripheral Pin from General-Purpose Output to Input Mode Timing
- Peripheral pins include CLKX0, CLKR0, DX0, DR0, FSX0, FSR0, and TCLK0/1.
Figure 20. Change of Peripheral Pin from General-Purpose Input to Output Mode Timing
Figure 21. Timer Pin Timing, Input
Figure 22. Timer Pin Timing, Output
Enabling SHZ destroys SMx320VC33 register and memory contents. Assert SHZ = 1 and reset the SMx320VC33 to restore it to a known condition.
Figure 23. Timing for SHZ
Figure 24. IEEE-1149.1 Test Access Port Timings