
Serial Peripheral Interface Module (SPI)
Technical Data
MC68HC08AB16A
—
Rev. 2.0
272
Serial Peripheral Interface Module (SPI)
MOTOROLA
16.13.3 SPSCK (Serial Clock). . . . . . . . . . . . . . . . . . . . . . . . . . . . .294
16.13.4 SS (Slave Select). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .294
16.13.5 CGND (Clock Ground) . . . . . . . . . . . . . . . . . . . . . . . . . . . .295
16.14 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .296
16.14.1 SPI Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .296
16.14.2 SPI Status and Control Register . . . . . . . . . . . . . . . . . . . .298
16.14.3 SPI Data Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .301
16.2 Introduction
This section describes the serial peripheral interface (SPI) module,
which allows full-duplex, synchronous, serial communications with
peripheral devices.
16.3 Features
Features of the SPI module include the following:
Full-duplex operation
Master and slave modes
Double-buffered operation with separate transmit and receive
registers
Four master mode frequencies (maximum = bus frequency
÷
2)
Maximum slave mode frequency = bus frequency
Serial clock with programmable polarity and phase
Two separately enabled interrupts:
–
SPRF (SPI receiver full)
–
SPTE (SPI transmitter empty)
Mode fault error flag with CPU interrupt capability
Overflow error flag with CPU interrupt capability
Programmable wired-OR mode
I
2
C (inter-integrated circuit) compatibility
I/O (input/output) port bit(s) software configurable with pullup
device(s) if configured as input port bit(s)