MC68HC812A4 Datasheet, PDF (281/342 Pages) Motorola, Inc – 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus. Modules include

Serial Peripheral Interface (SPI)
Interrupt Sources
If SPI functions are not required during wait mode, reduce power
consumption by disabling the SPI before executing the WAIT instruction.
15.9.3 Stop Mode
For reduced power consumption, the SPI is inactive in stop mode. The
STOP instruction does not affect SPI register states. SPI operation
resumes after an external interrupt.
Exiting stop mode by reset aborts any transmission in progress and
resets the SPI. Entering stop mode during a transmission results in
invalid data.
15.10 Interrupt Sources
Table 15-4. SPI Interrupt Sources
Interrupt
Source
Transmission complete
Mode fault
Flag
SPIF
MODF
Local
Enable
SPIE
CCR
Mask
I bit
Vector
Address
$FFD8, $FFD9
15.11 General-Purpose I/O Ports
Port S shares its pins with the multiple serial interface (MSI). In all
modes, port S pins PS7–PS0 are available for either general-purpose
I/O or for SCI and SPI functions. See Section 13. Multiple Serial
Interface (MSI).
Advance Information
MOTOROLA
Serial Peripheral Interface (SPI)
MC68HC812A4 — Rev. 3.0
281