mc9s08qg4 Freescale Semiconductor, Inc, mc9s08qg4 Datasheet - Page 217
mc9s08qg4
Manufacturer Part Number
mc9s08qg4
Description
Hcs08 Microcontrollers Microcontroller Family
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S08QG4.pdf
(314 pages)
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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 (SPR2:SPR1:SPR0) divide the output of the prescaler stage by 2, 4, 8, 16, 32, 64, 128, or 256
to get the internal SPI master mode bit-rate clock.
Freescale Semiconductor
BUS RATE
CLOCK
SPI SYSTEM
ENABLE
LSBFE
MSTR
SPE
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
MC9S08QG8 and MC9S08QG4 Data Sheet, Rev. 4
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
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
217
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