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參數資料
型號: MC68HSC05C8A
廠商: Motorola, Inc.
英文描述: 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述: 8位微控制器單元(MCU)。(8位微控制器)
文件頁數: 83/156頁
文件大小: 755K
代理商: MC68HSC05C8A
Serial Peripiheral Interface (SPI)
SPI Signal Description
MC68HC05C8A
Rev. 3.0
General Release Specification
MOTOROLA
Serial Peripiheral Interface (SPI)
83
L
G
R
10.4.3 Serial Clock (SCK)
The master clock is used to synchronize data movement both in and out
of the device through its MOSI and MISO lines. The master and slave
devices are capable of exchanging a byte of information during a
sequence of eight clock cycles. Since SCK is generated by the master
device, this line becomes an input on a slave device.
As shown in
Figure 10-1
, four possible timing relationships may be
chosen by using control bits CPOL and CPHA in the serial peripheral
control register (SPCR). Both master and slave devices must operate
with the same timing. The master device always places data on the
MOSI line one-half cycle before the clock edge (SCK), so the slave
device can latch the data.
Two bits (SPR0 and SPR1) in the SPCR of the master device select the
clock rate. In a slave device, SPR0 and SPR1 have no effect on the SPI
operation.
Figure 10-1. Data Clock Timing Diagram
INTERNAL STROBE FOR DATA CAPTURE (ALL MODES)
MSB
6
5
4
3
2
1
0
SS
SCK
SCK
SCK
SCK
MISO/MOSI
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