参数资料
型号: MC68HC711D3MFN3
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PQCC44
封装: PLASTIC, LCC-44
文件页数: 146/157页
文件大小: 2252K
代理商: MC68HC711D3MFN3
Serial Peripheral Interface (SPI)
Clock Phase and Polarity Controls
MC68HC711D3 — Rev. 2
Data Sheet
MOTOROLA
Serial Peripheral Interface (SPI)
89
Figure 7-2. SPI Transfer Format
7.4 Clock Phase and Polarity Controls
Software can select one of four combinations of serial clock phase and polarity
using two bits in the SPI control register (SPCR). The clock polarity is specified by
the CPOL control bit, which selects an active high or active low clock, and has no
significant effect on the transfer format. The clock phase (CPHA) control bit selects
one of two different transfer formats. The clock phase and polarity should be
identical for the master SPI device and the communicating slave device. In some
cases, the phase and polarity are changed between transfers to allow a master
device to communicate with peripheral slaves having different requirements.
When CPHA equals 0, the slave select (SS) line must be negated and reasserted
between each successive serial byte. Also, if the slave writes data to the SPI data
register (SPDR) while SS is active low, a write collision error results.
When CPHA equals 1, the SS line can remain low between successive transfers.
2345678
1
SCK (CPOL = 1)
SCK (CPOL = 0)
SCK CYCLE #
SS (TO SLAVE)
654321
LSB
MSB
654321
LSB
1
2
3
5
4
SLAVE CPHA=1 TRANSFER IN PROGRESS
MASTER TRANSFER IN PROGRESS
SLAVE CPHA=0 TRANSFER IN PROGRESS
1. SS ASSERTED
2. MASTER WRITES TO SPDR
3. FIRST SCK EDGE
4. SPIF SET
5. SS NEGATED
SAMPLE INPUT
DATA OUT
(CPHA = 0)
SAMPLE INPUT
DATA OUT
(CPHA = 1)
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