mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 276

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 9 Serial Peripheral Interface (SPIV3)
9.1.3
Figure 9-1
data registers, shifter logic, baud rate generator, master/slave control logic, and port control logic.
9.2
This section lists the name and description of all ports including inputs and outputs that do, or may, connect
off chip. The SPIV3 module has a total of four external pins.
9.2.1
This pin is used to transmit data out of the SPI module when it is configured as a master and receive data
when it is configured as slave.
276
Bus Clock
Interrupt
Request
SPI
External Signal Description
gives an overview on the SPI architecture. The main parts of the SPI are status, control, and
Block Diagram
MOSI — Master Out/Slave In Pin
SPPR
SPI
SPI Baud Rate Register
Prescaler
SPI Control Register 1
SPI Control Register 2
Baud Rate Generator
SPI Status Register
SPI Data Register
Interrupt Control
SPIF
3
SPR
Clock Select
MODF
Counter
3
SPTEF
MC9S12E256 Data Sheet, Rev. 1.08
Figure 9-1. SPI Block Diagram
Baud Rate
LSBFE=1
LSBFE=0
8
8
Control
Control
Master
Slave
Master Baud Rate
Slave Baud Rate
MSB
2
2
Shifter
LSBFE=1
LSBFE=0
LSBFE=0
LSBFE=1
CPOL
Clock
Shift
Phase +
Polarity
Control
Phase +
Polarity
Control
LSB
CPHA
Sample
Clock
BIDIROE
SPC0
data out
SCK in
SCK out
data in
Control
Logic
Freescale Semiconductor
Port
MOSI
SCK
SS