mc9s08sg4 Freescale Semiconductor, Inc, mc9s08sg4 Datasheet - Page 221

• Manufacturer Part Number: mc9s08sg4
• Description: 8-bit Microcontroller Family
• Manufacturer: Freescale Semiconductor, Inc

15.1.3
As shown in
prescale bits (SPPR2:SPPR1:SPPR0) choose a prescale divisor of 1, 2, 3, 4, 5, 6, 7, or 8. The three rate
select bits (SPR3,SPR2:SPR1:SPR0) divide the output of the prescaler stage by 2, 4, 8, 16, 32, 64, 128,
256,or 512
Freescale Semiconductor
BUS RATE
CLOCK
SPI SYSTEM
ENABLE
LSBFE
MSTR
SPE
to get the internal SPI master mode bit-rate clock.
SPI Baud Rate Generation
CLOCK GENERATOR
Figure
SPIBR
MASTER/SLAVE
MODE SELECT
15-4, the clock source for the SPI baud rate generator is the bus clock. The three
SHIFT
OUT
SHIFT
DIRECTION
Tx BUFFER (WRITE SPID)
Rx BUFFER (READ SPID)
MODE FAULT
DETECTION
SPI SHIFT REGISTER
CLOCK
CLOCK
LOGIC
Figure 15-3. SPI Module Block Diagram
SHIFT
MC9S08SG8 MCU Series Data Sheet, Rev. 3
MODF
Rx BUFFER
SPRF
FULL
Tx BUFFER
EMPTY
SHIFT
SPTEF
SPTIE
SPIE
IN
MASTER CLOCK
SLAVE CLOCK
BIDIROE
MODFEN
SPC0
SSOE
Chapter 15 Serial Peripheral Interface (S08SPIV3)
PIN CONTROL
M
S
M
S
M
S
MASTER/
SLAVE
SPI
INTERRUPT
REQUEST
MOSI
(MOMI)
MISO
(SISO)
SPSCK
SS
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