参数资料
型号: MC68HC705C9ACS
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, UVPROM, 2.1 MHz, MICROCONTROLLER
文件页数: 7/177页
文件大小: 1941K
代理商: MC68HC705C9ACS
Serial Peripheral Interface (SPI)
Advance Information
MC68HC705C9A — Rev. 4.0
104
Serial Peripheral Interface (SPI)
MOTOROLA
10.3 Features
Features include:
Full-duplex, four-wire synchronous transfers
Master or slave operation
Bus frequency divided by 2 (maximum) master bit frequency
Bus frequency (maximum) slave bit frequency
Four programmable master bit rates
Programmable clock polarity and phase
End of transmission interrupt flag
Write collision flag protection
Master-master mode fault protection capability
10.4 SPI Signal Description
The four basic signals (MOSI, MISO, SCK, and SS) are described in the
following paragraphs. Each signal function is described for both the
master and slave modes.
NOTE:
In C9A mode, any SPI output line has to have its corresponding data
direction register bit set. If this bit is clear, the line is disconnected from
the SPI logic and becomes a general-purpose input line. When the SPI
is enabled, any SPI input line is forced to act as an input regardless of
what is in the corresponding data direction register bit.
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