MC68HC908LJ12CPB FREESCALE [Freescale Semiconductor, Inc], MC68HC908LJ12CPB Datasheet - Page 272

• Manufacturer Part Number: MC68HC908LJ12CPB
• Description: 8-bit microcontroller units
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

14.5.1 Master Mode
MC68HC908LJ12
Freescale Semiconductor
NOTE:
—
Rev. 2.1
The SPI operates in master mode when the SPI master bit, SPMSTR, is
set.
Configure the SPI modules as master or slave before enabling them.
Enable the master SPI before enabling the slave SPI. Disable the slave
SPI before disabling the master SPI. (See
Register.)
Only a master SPI module can initiate transmissions. Software begins
the transmission from a master SPI module by writing to the transmit
data register. If the shift register is empty, the byte immediately transfers
to the shift register, setting the SPI transmitter empty bit, SPTE. The byte
begins shifting out on the MOSI pin under the control of the serial clock.
(See
SHIFT REGISTER
Figure
GENERATOR
MASTER MCU
BAUD RATE
Serial Peripheral Interface Module (SPI)
Figure 14-3. Full-Duplex Master-Slave Connections
14-3.)
MISO
MOSI
SPSCK
SS
V
DD
Serial Peripheral Interface Module (SPI)
14.14.1 SPI Control
SPSCK
MISO
MOSI
SS
SHIFT REGISTER
SLAVE MCU
Technical Data
273