MAC7200 datasheet(516/976 Pages) FREESCALE

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Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

438

Freescale Semiconductor

23.4.5.3

JTAG Reset

The DEBUG_RESET line can also be asserted via a JTAG command (see Figure 23-19). This causes a

much shorter reset sequence, solely for the DEBUG_RESET - other parts of the device are not affected.

NOTE

The JTAG reset sequence can not be mixed with another reset sequence.

Figure 23-19. RESET Timing controlled by JTAG

23.4.5.4

Clock Monitor Reset

The CRG generates a Clock Monitor Reset when all of the following conditions are true:

•

Clock monitor is enabled (CME=1)

•

Loss of clock is detected

•

Self-Clock Mode is disabled (CMRD=0)

The reset event asynchronously forces the configuration registers to their default settings (see

Section 23.3, “Memory Map and Register Definition).” The CME and the CMRD are reset to logical ‘1’

(which doesn’t change the state of the CME bit, because it has already been set). As a consequence, the

CRG immediately enters Self Clock Mode and starts its internal reset sequence. In parallel, the clock

quality check starts. As soon as the clock quality check indicates a valid Oscillator Clock, the CRG

switches to OSCCLK and leaves Self Clock Mode. Since the clock quality checker is running in parallel

with the reset generator, the CRG may leave Self Clock Mode while still completing the internal reset

sequence. When the reset sequence is finished, the CRG checks the internally latched state of the clock

monitor fail circuit.

23.4.5.5

Software Watchdog Timer (SWT) Reset

The CRG will generate a reset if the Watchdog reset is indicated by the ARM platform.

23.4.5.6

Power On Reset, Low Voltage Reset

The on-chip voltage regulators detect when VDDs to the MCU have reached a certain level and assert a

power on reset or low voltage reset or both. As soon as a power on reset or low voltage reset is triggered,

Apply JTAG

command

16 +n cycles

DEBUG_RESET

FLASH_RESET

RESET / SYS_RES

MAC7200 Datasheet(PDF) 516 Page - Freescale Semiconductor, Inc

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