MC68HC908LJ24 Datasheet, PDF (288/464 Pages) Motorola, Inc – Microcontrollers

Serial Peripheral Interface Module (SPI)
14.13.3 SPSCK (Serial Clock). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310
14.13.4 SS (Slave Select) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310
14.13.5 CGND (Clock Ground) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311
14.14 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312
14.14.1 SPI Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312
14.14.2 SPI Status and Control Register . . . . . . . . . . . . . . . . . . . . 314
14.14.3 SPI Data Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317
14.2 Introduction
This section describes the serial peripheral interface (SPI) module,
which allows full-duplex, synchronous, serial communications with
peripheral devices.
14.3 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
Data Sheet
288
MC68HC908LJ24/LK24 — Rev. 2.1
Serial Peripheral Interface Module (SPI)
Freescale Semiconductor