mc68hc908mr32 Freescale Semiconductor, Inc, mc68hc908mr32 Datasheet - Page 197

• Manufacturer Part Number: mc68hc908mr32
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

15.4 Functional Description
Figure 15-2
the SPI I/O registers.
The SPI module allows full-duplex, synchronous, serial communication between the microcontroller unit
(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.
Freescale Semiconductor
RECEIVER/ERROR CPU INTERRUPT REQUEST
TRANSMITTER CPU INTERRUPT REQUEST
SPMSTR
DIVIDER
shows the structure of the SPI module and
CLOCK
CGMOUT ÷ 2
(FROM SIM)
÷ 128
SPE
÷ 32
÷ 2
÷ 8
SPR1
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
SELECT
CLOCK
Figure 15-2. SPI Module Block Diagram
SPR0
7
CONTROL
TRANSMIT DATA REGISTER
RECEIVE DATA REGISTER
6
SPI
SHIFT REGISTER
INTERNAL BUS
5
4
3
MODF
SPRF
OVRF
SPTE
SPMSTR
Figure 15-3
2
1
MODFEN
ERRIE
SPRIE
SPTIE
SPE
0
CLOCK
LOGIC
CPHA
shows the locations and contents of
CPOL
SPWOM
M
S
CONTROL
LOGIC
PIN
Functional Description
MISO
MOSI
SPSCK
SS
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