
Serial Peripheral Interface (SPI)
Block Diagram
Advance Information
MC68HC812A4
—
Rev. 3.0
MOTOROLA
Serial Peripheral Interface (SPI)
265
15.4 Block Diagram
Figure 15-1. SPI Block Diagram
MOSI OR MOMI
SCK
SS
MISO OR SISO
INTERRUPT
REQUEST
BAUD
RATE
SELECT
DIVIDER
CLOCK
CLOCK
LOGIC
CPHA
CPOL
SPI
LSBF
SSOE
SWOM
MODF
WCOL
SPIF
SPC0
RDS
SPE
MSTR
CONTROL
PUPS
SPR0
SPR2
SPR1
P-CLOCK
SHIFT REGISTER
PORT S DATA
DIRECTION REGISTER
PORT S DATA REG.
7
6 5 4
SPIE
MSTR
SHIFT
CONTROL
LOGIC
SPI DATA REGISTER
(WRITE)
SPI DATA REGISTER
(READ)
PIN CONTROL LOGIC