MC68HC08AZ32A Datasheet, PDF (213/312 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Chapter 16
Serial Peripheral Interface (SPI)
16.1 Introduction
This section describes the serial peripheral interface module (SPI), which allows full-duplex, synchronous,
serial communications with peripheral devices.
16.2 Features
Features include:
• 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 Data Sheet, Rev. 2
Freescale Semiconductor
213