MC68HC708XL36 FREESCALE [Freescale Semiconductor, Inc], MC68HC708XL36 Datasheet - Page 223

• Manufacturer Part Number: MC68HC708XL36
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Low-Power Modes
Wait Mode
23-spi_c
MOTOROLA
The following items are reset only by a system reset:
By not resetting the control bits when SPE is low, the user can clear SPE
between transmissions without having to set all control bits again when
SPE is set back high for the next transmission.
By not resetting the SPRF, OVRF, and MODF flags, the user can still
service these interrupts after the SPI has been disabled. The user can
disable the SPI by writing 0 to the SPE bit. The SPI can also be disabled
by a mode fault occuring in an SPI that was configured as a master with
the MODFEN bit set.
The WAIT and STOP instructions put the MCU in low-power-consump-
tion standby modes.
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.
The DMA can service the SPI without exiting wait mode.
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Freescale Semiconductor, Inc.
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The SPI state counter is cleared, making it ready for a new
complete transmission.
All the SPI port logic is defaulted back to being general purpose
I/O.
All control bits in the SPCR register.
All control bits in the SPSCR register (MODFEN, ERRIE, SPR1,
and SPR0).
The status flags SPRF, OVRF, and MODF.
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SPI
Low-Power Modes
MC68HC708XL36
223
SPI