MC68HC08AZ32A Datasheet, PDF (231/456 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Serial Peripheral Interface (SPI)
Functional Description
INTERNAL BUS
TRANSMIT DATA REGISTER
BUS CLOCK
÷2
CLOCK ^{÷ 8}
DIVIDER _{÷ 32}
÷ 128
SHIFT REGISTER
76543210
RECEIVE DATA REGISTER
SPMSTR SPE
CLOCK
SELECT
SPR1 SPR0
CLOCK
LOGIC
PIN
CONTROL
LOGIC
M
S
SPMSTR CPHA CPOL
MISO
MOSI
SPSCK
SS
TRANSMITTER CPU INTERRUPT REQUEST
RECEIVER/ERROR CPU INTERRUPT REQUEST
SPI
CONTROL
MODFEN
ERRIE
SPTIE
SPRIE
SPWOM
SPE
SPRF
SPTE
OVRF
MODF
Figure 16-2. SPI Module Block Diagram
The SPI module allows full-duplex, synchronous, serial communication
between the MCU and peripheral devices, including other MCUs.
Software can poll the SPI status flags or SPI operation can be interrupt-
driven. All SPI interrupts can be serviced by the CPU.
The following paragraphs describe the operation of the SPI module.
MC68HC08AZ32A — Rev 1.0
MOTOROLA
Serial Peripheral Interface (SPI)
For More Information On This Product,
Go to: www.freescale.com
Technical Data
231