MC68HC08XL36 Datasheet, PDF (194/362 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
SPI
Functional Description
Figure 1 shows the structure of the SPI module and Figure 2 shows the
locations and contents of the SPI I/O registers.
INTERNAL BUS
TRANSMIT DATA REGISTER
BUS CLOCK ÷ 2
÷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 DMA SERVICE REQUEST
TRANSMITTER CPU INTERRUPT REQUEST
RECEIVER DMA SERVICE REQUEST
RECEIVER/ERROR CPU INTERRUPT REQUEST
SPI
CONTROL
MODFEN
ERRIE
SPTIE
SPRIE
DMAS
SPE
SPWOM
SPRF
SPTE
OVRF
MODF
Figure 1. SPI Module Block Diagram
MC68HC08XL36
194
Serial Peripheral Interface Module (SPI)
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4-spi_c
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