mc68hc908lj24 Freescale Semiconductor, Inc, mc68hc908lj24 Datasheet - Page 290

• Manufacturer Part Number: mc68hc908lj24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Serial Peripheral Interface Module (SPI)
14.5 Functional Description
Data Sheet
290
RECEIVER/ERROR CPU INTERRUPT REQUEST
TRANSMITTER CPU INTERRUPT REQUEST
SPMSTR
DIVIDER
CLOCK
CGMOUT ÷ 2
FROM SIM
÷ 128
SPE
÷ 32
÷ 2
÷ 8
Figure 14-2
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
shows the structure of the SPI module.
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
MC68HC908LJ24/LK24 — Rev. 2.1
CPOL
SPWOM
M
S
Freescale Semiconductor
CONTROL
LOGIC
PIN
MISO
MOSI
SPSCK
SS