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參數(shù)資料
| 型號： | MC68HC08AS20FN |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | M68HC08 Microcontrollers |
| 中文描述： | M68HC08系列微控制器 |
| 文件頁數(shù)： | 280/386頁 |
| 文件大小： | 3960K |
| 代理商： | MC68HC08AS20FN |
Advance Information
MC68HC08AS20
—
Rev. 4.1
280
Freescale Semiconductor
Figure 18-4. CPHA/SS Timing
When CPHA = 0 for a slave, the falling edge of SS indicates the
beginning of the transmission. This causes the SPI to leave its idle state
and begin driving the MISO pin with the MSB of its data. Once the
transmission begins, no new data is allowed into the shift register from
the transmit data register. Therefore, the SPI data register of the slave
must be loaded with transmit data before the falling edge of SS. Any data
written after the falling edge is stored in the transmit data register and
transferred to the shift register after the current transmission.
18.6.3 Transmission Format When CPHA = 1
Figure 18-5
shows an SPI transmission in which CPHA (SPCR) is
logic 1. The figure should not be used as a replacement for data sheet
parametric information. Two waveforms are shown for SCK: one for
CPOL = 0 and another for CPOL = 1. The diagram may be interpreted
as a master or slave timing diagram since the serial clock (SCK), master
in/slave out (MISO), and master out/slave in (MOSI) pins are directly
connected between the master and the slave. The MISO signal is the
output from the slave, and the MOSI signal is the output from the master.
The SS line is the slave select input to the slave. The slave SPI drives
its MISO output only when its slave select input (SS) is at logic 0, so that
only the selected slave drives to the master. The SS pin of the master is
not shown but is assumed to be inactive. The SS pin of the master must
be high or must be reconfigured as general-purpose I/O not affecting the
SPI. (See
18.7.2 Mode Fault Error
.) When CPHA = 1, the master
BYTE 1
BYTE 3
MISO/MOSI
BYTE 2
MASTER SS
SLAVE SS
CPHA = 0
SLAVE SS
CPHA = 1
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