MC68HC908LJ12CPB FREESCALE [Freescale Semiconductor, Inc], MC68HC908LJ12CPB Datasheet - Page 271

• Manufacturer Part Number: MC68HC908LJ12CPB
• Description: 8-bit microcontroller units
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Serial Peripheral Interface Module (SPI)
Technical Data
272
RECEIVER/ERROR CPU INTERRUPT REQUEST
TRANSMITTER CPU INTERRUPT REQUEST
SPMSTR
DIVIDER
CLOCK
CGMOUT ÷ 2
FROM SIM
÷ 128
SPE
÷ 32
÷ 2
÷ 8
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.
The following paragraphs describe the operation of the SPI module.
Figure 14-2. SPI Module Block Diagram
SPR1
SELECT
CLOCK
RESERVED
RESERVED
Serial Peripheral Interface Module (SPI)
SPR0
TRANSMIT DATA REGISTER
7
RECEIVE DATA REGISTER
CONTROL
6
SPI
SHIFT REGISTER
INTERNAL BUS
5
4
3
MODF
OVRF
SPRF
SPTE
SPMSTR
2
1
MODFEN
ERRIE
SPTIE
SPRIE
SPE
CLOCK
0
LOGIC
CPHA
R
CPOL
SPWOM
MC68HC908LJ12
M
S
Freescale Semiconductor
CONTROL
LOGIC
PIN
—
MISO
MOSI
SPSCK
SS
Rev. 2.1