
Low-Power Modes
Serial Peripheral Interface Module (SPI)
MC68HC08GP8A
Data Sheet
MOTOROLA
Low-Power Modes
105
9.11 Serial Peripheral Interface Module (SPI)
9.11.1 Wait Mode
The SPI module remains active in wait mode. Any enabled CPU interrupt request
from the SPI module can bring the MCU out of wait mode.
If SPI module functions are not required during wait mode, reduce power
consumption by disabling the SPI module before executing the WAIT instruction.
9.11.2 Stop Mode
The SPI module is inactive in stop mode. The STOP instruction does not affect SPI
register states. SPI operation resumes after an external interrupt. If stop mode is
exited by reset, any transfer in progress is aborted, and the SPI is reset.
9.12 Timer Interface Module (TIM1 and TIM2)
9.12.1 Wait Mode
The TIM remains active in wait mode. Any enabled CPU interrupt request from the
TIM can bring the MCU out of wait mode.
If TIM functions are not required during wait mode, reduce power consumption by
stopping the TIM before executing the WAIT instruction.
9.12.2 Stop Mode
The TIM is inactive in stop mode. The STOP instruction does not affect register
states or the state of the TIM counter. TIM operation resumes when the MCU exits
stop mode after an external interrupt.
9.13 Timebase Module (TBM)
9.13.1 Wait Mode
The timebase module remains active after execution of the WAIT instruction.
In wait mode, the timebase register is not accessible by the CPU.
If the timebase functions are not required during wait mode, reduce the power
consumption by stopping the timebase before enabling the WAIT instruction.
9.13.2 Stop Mode
The timebase module may remain active after execution of the STOP instruction
if the oscillator has been enabled to operate during stop mode through the
OSCSTOPEN bit in the MOR register. The timebase module can be used in this
mode to generate a periodic wakeup from stop mode.
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.