HCS08 datasheet(38/290 Pages) MOTOROLA

38 / 290 page

Modes of Operation

MC9S08GB/GT

MOTOROLA

3.6.6 On-Chip Peripheral Modules in Stop Modes

When the MCU enters any stop mode, system clocks to the internal peripheral modules are stopped. Even

in the exception case (ENBDM = 1), where clocks are kept alive to the background debug logic, clocks to

the peripheral systems are halted to reduce power consumption. Refer to 3.6.1 Stop1 Mode, 3.6.2 Stop2

Mode, and 3.6.3 Stop3 Mode for specific information on system behavior in stop modes.

I/O Pins

•

All I/O pin states remain unchanged when the MCU enters stop3 mode.

•

If the MCU is configured to go into stop2 mode, all I/O pins states are latched before entering stop.

•

If the MCU is configured to go into stop1 mode, all I/O pins are forced to their default reset state

upon entry into stop.

Memory

•

All RAM and register contents are preserved while the MCU is in stop3 mode.

•

All registers will be reset upon wake-up from stop2, but the contents of RAM are preserved and pin

states remain latched until the PPDACK bit is written. The user may save any memory-mapped

•

All registers will be reset upon wake-up from stop1 and the contents of RAM are not preserved. The

MCU must be initialized as upon reset. The contents of the FLASH memory are non-volatile and

are preserved in any of the stop modes.

ICG — In stop3 mode, the ICG enters its low-power standby state. Either the oscillator or the internal

reference may be kept running when the ICG is in standby by setting the appropriate control bit. In both

stop2 and stop1 modes, the ICG is turned off. Neither the oscillator nor the internal reference can be kept

running in stop2 or stop1, even if enabled within the ICG module.

TPM — When the MCU enters stop mode, the clock to the TPM1 and TPM2 modules stop. The modules

halt operation. If the MCU is configured to go into stop2 or stop1 mode, the TPM modules will be reset

upon wake-up from stop and must be reinitialized.

ATD — When the MCU enters stop mode, the ATD will enter a low-power standby state

. No conversion

operation will occur while in stop. If the MCU is configured to go into stop2 or stop1 mode, the ATD will

be reset upon wake-up from stop and must be reinitialized.

KBI — During stop3, the KBI pins that are enabled continue to function as interrupt sources that are

capable of waking the MCU from stop3. The KBI is disabled in stop1 and stop2 and must be reinitialized

after waking up from either of these modes.

SCI — When the MCU enters stop mode, the clocks to the SCI1 and SCI2 modules stop. The modules

halt operation. If the MCU is configured to go into stop2 or stop1 mode, the SCI modules will be reset

upon wake-up from stop and must be reinitialized.

SPI — When the MCU enters stop mode, the clocks to the SPI module stop. The module halts operation.

If the MCU is configured to go into stop2 or stop1 mode, the SPI module will be reset upon wake-up from

stop and must be reinitialized.

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