mc9s08jm16 Freescale Semiconductor, Inc, mc9s08jm16 Datasheet - Page 244

• Manufacturer Part Number: mc9s08jm16
• Description: S08jm 8-bit Usb Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Serial Peripheral Interface (S08SPI16V1)
15.2
The SPI optionally shares four port pins. The function of these pins depends on the settings of SPI control
bits. When the SPI is disabled (SPE = 0), these four pins revert to being general-purpose port I/O pins that
are not controlled by the SPI.
15.2.1
When the SPI is enabled as a slave, this pin is the serial clock input. When the SPI is enabled as a master,
this pin is the serial clock output.
244
BUS RATE
CLOCK
SPI SYSTEM
SPIMODE
ENABLE
LSBFE
MSTR
SPE
External Signal Description
SPSCK — SPI Serial Clock
CLOCK GENERATOR
SPIBR
MASTER/SLAVE
MODE SELECT
SHIFT
OUT
8 OR 16
BIT MODE
SHIFT
DIRECTION
Tx BUFFER (WRITE SPIxDH:SPIxDL)
Rx BUFFER (READ SPIxDH:SPIxDL)
MODE FAULT
DETECTION
CLOCK
CLOCK
LOGIC
SHIFT
Figure 15-4. SPI Module Block Diagram
SPI SHIFT REGISTER
MODF
MC9S08JM16 Series Data Sheet, Rev. 2
Rx BUFFER
SPRF
FULL
Tx BUFFER
EMPTY
SHIFT
SPTEF
SPTIE
SPIE
IN
MASTER CLOCK
SLAVE CLOCK
16-BIT COMPARATOR
BIDIROE
MODFEN
SPC0
SSOE
SPIxMH:SPIxML
16-BIT LATCH
PIN CONTROL
M
S
M
S
M
S
MASTER/
SLAVE
Freescale Semiconductor
SPMIE
SPMF
SPI
INTERRUPT
REQUEST
MOSI
(MOMI)
MISO
(SISO)
SPSCK
SS