MC68HC908GP32_08 Datasheet, PDF (177/266 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

INTERNAL BUS
Functional Description
TRANSMIT DATA REGISTER
BUSCLK
÷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
SPE
SPWOM
SPRF
SPTE
OVRF
MODF
Figure 15-2. SPI Module Block Diagram
MASTER MCU
SLAVE MCU
SHIFT REGISTER
BAUD RATE
GENERATOR
MISO
MOSI
SPSCK
SS
MISO
MOSI
SPSCK
V_DD
SS
SHIFT REGISTER
Figure 15-3. Full-Duplex Master-Slave Connections
MC68HC908GP32 Data Sheet, Rev. 10
Freescale Semiconductor
177