MC68HC05C8A Datasheet, PDF (87/158 Pages) Motorola, Inc – Microcontrollers

Technical Data — MC68HC05C8A • MC68HCL05C8A • MC68HSC05C8A
Section 10. Serial Peripheral Interface (SPI)
10.1 Contents
10.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
10.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
10.4 SPI Signal Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88
10.4.1 Master In Slave Out (MISO) . . . . . . . . . . . . . . . . . . . . . . . . . 88
10.4.2 Master Out Slave In (MOSI) . . . . . . . . . . . . . . . . . . . . . . . . . 88
10.4.3 Serial Clock (SCK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
10.4.4 Slave Select (SS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
10.5 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90
10.6 SPI Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92
10.6.1 Serial Peripheral Control Register . . . . . . . . . . . . . . . . . . . . 93
10.6.2 Serial Peripheral Status Register . . . . . . . . . . . . . . . . . . . . .94
10.6.3 Serial Peripheral Data I/O Register . . . . . . . . . . . . . . . . . . . 96
10.2 Introduction
The serial peripheral interface (SPI) is an interface built into the
MC68HC05 microcontroller unit (MCU) which allows several
MC68HC05 MCUs or MC68HC05 MCU plus peripheral devices to be
interconnected within a single printed circuit board. In an SPI, separate
wires are required for data and clock. In the SPI format, the clock is not
included in the data stream and must be furnished as a separate signal.
An SPI system may be configured in a system containing one master
MCU and several slave MCUs or in a system in which an MCU is
capable of being a master or a slave.
MC68HC05C8A • MC68HCL05C8A • MC68HSC05C8A — Rev. 5.0
MOTOROLA
Serial Peripheral Interface (SPI)
Technical Data
87