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MC33742 Datasheet(PDF) 26 Page - Motorola, Inc |
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MC33742 Datasheet(HTML) 26 Page - Motorola, Inc |
26 / 52 page 33742 MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA 26 Figure 12. Entering Debug Mode When the 33742 is in debug mode and has been set into Stop Debug or Sleep, a wake-up causes the 33742 to enter the Normal Request mode for 350 ms. To avoid having the 33742 generate a reset (enter Reset mode), the desired next debug mode (Normal Debug or Standby Debug) should be configured within the 350 ms time period of the Normal Request mode. To avoid entering debug mode after a power-up, first read the BATFAIL bit (MCR read) and write 0000 into the MCR register. Figure 13 below and Figure 14, page 27, show the detailed operation of the 33742 once the debug mode has been selected. Figure 13. Transitions to Enter Debug Modes VSUP SPI MCR (Step 4) BATFAIL VDD Debug Mode MCR (Step 5) SPI: Read BATFAIL MCR (Step 6) 33742/33742S in Debug mode. 33742/33742S not in Debug mode. TIM1(Step 3) No Watchdog Watchdog ON Normal Request Standby Debug SPI: MCR (0000) and Normal Debug Normal Reset Reset Counter (3.4 ms) Expired Watchdog: Timeout 350 ms Normal Debug SPI: MCR (0000) and Standby Debug Power Down Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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