MC33742 datasheet(26/52 Pages) MOTOROLA

Part #	MC33742

Description	System Basis Chip (SBC) with Enhanced High-Speed CAN Transceiver

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Manufacturer	MOTOROLA [Motorola, Inc]

Direct Link	http://www.freescale.com

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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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MC33742 Datasheet(PDF) 26 Page - Motorola, Inc

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