MC68HC908AT32 Datasheet, PDF (165/378 Pages) Freescale Semiconductor, Inc – Microcontrollers

INTERNAL BUS
Functional Description
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 17-2. SPI Module Block Diagram
MASTER MCU
SHIFT REGISTER
BAUD RATE
GENERATOR
MISO
MOSI
SPSCK
SS
MISO
SLAVE MCU
MOSI
SPSCK
SHIFT REGISTER
SS
V_DD
Figure 17-3. Full-Duplex Master-Slave Connections
MC68HC908AT32 Data Sheet, Rev. 3.1
Freescale Semiconductor
165