MC68HC08AZ60 Datasheet, PDF (231/452 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
Serial Peripheral Interface Module (SPI)
Low-Power Modes
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, reduce power
consumption by disabling the SPI module before executing the WAIT
instruction.
To exit wait mode when an overflow condition occurs, enable the OVRF
bit to generate CPU interrupt requests by setting the error interrupt
enable bit (ERRIE). (See Interrupts on page 227).
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 the MCU exits stop mode. If stop mode is exited by reset,
any transfer in progress is aborted and the SPI is reset.
21-spi
MOTOROLA
MC68HC08AZ60 — Rev 1.0
Serial Peripheral Interface Module (SPI)
231
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