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MC68HC908LJ12 Datasheet, PDF (269/413 Pages) Freescale Semiconductor, Inc – 8-bit microcontroller units | |||
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Serial Peripheral Interface Module (SPI)
14.13.3 SPSCK (Serial Clock). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
14.13.4 SS (Slave Select) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
14.13.5 CGND (Clock Ground) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293
14.14 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294
14.14.1 SPI Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294
14.14.2 SPI Status and Control Register . . . . . . . . . . . . . . . . . . . . 296
14.14.3 SPI Data Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299
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
Technical Data
270
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:
â SPRF (SPI receiver full)
â 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
⢠I/O (input/output) port bit(s) software configurable with pullup
device(s) if configured as input port bit(s)
Serial Peripheral Interface Module (SPI)
MC68HC908LJ12 â Rev. 2.1
Freescale Semiconductor
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