MC68HC08AZ0 Datasheet, PDF (240/444 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
Serial Peripheral Interface Module (SPI)
Low-power modes
The WAIT and STOP instructions put the MCU in low
power-consumption standby modes.
WAIT mode
The SPI module remains active after the execution of a WAIT instruction.
In WAIT mode the SPI module registers are not accessible by the CPU.
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, power
consumption can be reduced by disabling the SPI module before
executing the WAIT instruction.
To exit WAIT mode when an overflow condition occurs, the OVRF bit
should be enabled to generate CPU interrupt requests by setting the
error interrupt enable bit (ERRIE). See Interrupts on page 234.
STOP mode
The SPI module is inactive after the execution of a STOP instruction.
The STOP instruction does not affect register conditions. 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.
MC68HC08AZ0
238
Serial Peripheral Interface Module (SPI)
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