參數(shù)資料
型號(hào): MC68HC705V8CFN
廠(chǎng)商: FREESCALE SEMICONDUCTOR INC
元件分類(lèi): 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC68
封裝: PLASTIC, LCC-68
文件頁(yè)數(shù): 5/172頁(yè)
文件大?。?/td> 890K
代理商: MC68HC705V8CFN
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SECTION 14: SERIAL PERIPHERAL INTERFACE
MOTOROLA
Page 91
MC68HC705V8 Specification Rev. 2.1
14.1.4
Slave Select (SS/PF0)
The slave select (SS) input line is used to select a slave device. It has to be low prior to
data transactions and must stay low for the duration of the transaction.The SS line on the
master must be tied high. If it goes low, a mode fault error flag (MODF) is set in the SPSR.
When CPHA=0, the shift clock is the OR of SS with SCK. In this clock phase mode, SS
must go high between successive characters in an SPI message. When CPHA=1, SS may
be left low for several SPI characters. In cases where there is only one SPI slave MCU, its
SS line could be tied to VSS as long as CPHA=1 clock modes are used. The SS pin is
shared with the PF0 pin. See 9.4 PORT F for additional information on the SS pin.
14.2
FUNCTIONAL DESCRIPTION
Figure 14-2 shows a block diagram of the serial peripheral interface circuitry. When a
master device transmits data to a slave via the MOSI line, the slave device responds by
sending data to the master device via the master’s MISO line. This implies full duplex
transmission with both data out and data in synchronized with the same clock signal. Thus,
the byte transmitted is replaced by the byte received and eliminates the need for separate
transmit-empty and receive-full status bits. A single status bit (SPIF) is used to signify that
the I/O operation has been completed.
The SPI is double buffered on read, but not on write. If a write is performed during data
transfer, the transfer occurs uninterrupted, and the write will be unsuccessful. This
condition will cause the write collision (WCOL) status bit in the SPSR to be set. After a data
byte is shifted, the SPIF flag of the SPSR is set.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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