MC68HC08AZ32A Datasheet, PDF (228/456 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Serial Peripheral Interface (SPI)
16.12.3 SPSCK (Serial Clock) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249
16.12.4 SS (Slave Select) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250
16.12.5 VSS (Clock Ground) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .251
16.13 I/O Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
16.13.1 SPI Control Register (SPCR) . . . . . . . . . . . . . . . . . . . . . .252
16.13.2 SPI Status and Control Register (SPSCR) . . . . . . . . . . . 254
16.13.3 SPI Data Register (SPDR) . . . . . . . . . . . . . . . . . . . . . . . . 258
16.2 Introduction
This section describes the serial peripheral interface module (SPI),
which allows full-duplex, synchronous, serial communications with
peripheral devices.
16.3 Features
Technical Data
228
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 with CPU service:
– 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
• I²C (inter-integrated circuit) compatibility
MC68HC08AZ32A — Rev 1.0
Serial Peripheral Interface (SPI)
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