Serial Peripheral Interface Module (SPI)
I/O Registers
MC68HC908AB32
—
Rev. 1.0
Technical Data
MOTOROLA
Serial Peripheral Interface Module (SPI)
305
SPMSTR — SPI Master Bit
This read/write bit selects master mode operation or slave mode
operation. Reset sets the SPMSTR bit.
1 = Master mode
0 = Slave mode
CPOL — Clock Polarity Bit
This read/write bit determines the logic state of the SPSCK pin
between transmissions. (See
.) To
transmit data between SPI modules, the SPI modules must have
identical CPOL values. Reset clears the CPOL bit.
CPHA — Clock Phase Bit
This read/write bit controls the timing relationship between the serial
clock and SPI data. (See
.) To transmit
data between SPI modules, the SPI modules must have identical
CPHA values. When CPHA = 0, the SS pin of the slave SPI module
must be set to logic 1 between bytes. (See
the CPHA bit.
SPWOM — SPI Wired-OR Mode Bit
This read/write bit disables the pullup devices on pins SPSCK, MOSI,
and MISO so that those pins become open-drain outputs.
1 = Wired-OR SPSCK, MOSI, and MISO pins
0 = Normal push-pull SPSCK, MOSI, and MISO pins
SPE — SPI Enable
This read/write bit enables the SPI module. Clearing SPE causes a
partial reset of the SPI. (See
the SPE bit.
1 = SPI module enabled
0 = SPI module disabled
SPTIE— SPI Transmit Interrupt Enable
This read/write bit enables CPU interrupt requests generated by the
SPTE bit. SPTE is set when a byte transfers from the transmit data
register to the shift register. Reset clears the SPTIE bit.
1 = SPTE CPU interrupt requests enabled
0 = SPTE CPU interrupt requests disabled
Содержание MC68HC908AB32
Страница 1: ...MC68HC908AB32 D REV 1 0 MC68HC908AB32 HCMOS Microcontroller Unit TECHNICAL DATA ...
Страница 2: ......
Страница 68: ...FLASH Memory Technical Data MC68HC908AB32 Rev 1 0 68 FLASH Memory MOTOROLA ...
Страница 84: ...EEPROM Technical Data MC68HC908AB32 Rev 1 0 84 EEPROM MOTOROLA ...
Страница 108: ...Central Processor Unit CPU Technical Data MC68HC908AB32 Rev 1 0 108 Central Processor Unit CPU MOTOROLA ...
Страница 130: ...System Integration Module SIM Technical Data MC68HC908AB32 Rev 1 0 130 System Integration Module SIM MOTOROLA ...
Страница 338: ...Input Output I O Ports Technical Data MC68HC908AB32 Rev 1 0 338 Input Output I O Ports MOTOROLA ...
Страница 364: ...Low Voltage Inhibit LVI Technical Data MC68HC908AB32 Rev 1 0 364 Low Voltage Inhibit LVI MOTOROLA ...
Страница 386: ...Electrical Specifications Technical Data MC68HC908AB32 Rev 1 0 386 Electrical Specifications MOTOROLA ...
Страница 390: ...Ordering Information Technical Data MC68HC908AB32 Rev 1 0 390 Ordering Information MOTOROLA ...
Страница 391: ......