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參數資料
型號: MC68HC05P4A
廠商: Motorola, Inc.
英文描述: 28-pin MCU (microcontroller unit) based on the MC68HC05P4(28引腳、基于MC68HC05P4升級的8位微控制器單元)
中文描述: 28引腳單片機(微控制器)的基礎上MC68HC05P4(28引腳,基于MC68HC05P4升級的8位微控制器單元)
文件頁數: 52/102頁
文件大小: 930K
代理商: MC68HC05P4A
Advance Information
MC68HC05P4A — Rev. 6.0
52
Simple Serial Input/Output Port (SIOP)
MOTOROLA
Simple Serial Input/Output Port (SIOP)
Figure 7-1. SIOP Block Diagram
7.3 Signal Format
The SIOP signal format is described here.
7.3.1 Serial Clock (SCK)
ThestateofSCKbetweentransmissionsmustbelogic1. Thefirstfalling
edge of SCK signals the beginning of a transmission. At this time, the
first bit of received data is accepted at the SDI pin and the first bit of
transmitted data is presented at the SDO pin. Data is captured at the
SDI pin on the rising edge of SCK. Subsequent falling edges shift the
data and accept or present the next bit. The transmission is ended upon
the eighth rising edge of SCK. The maximum frequency of SCK in slave
mode is equal to E (bus clock) divided by four. That is, for a 4-MHz
oscillator input, E becomes 2 MHz and the maximum SCK frequency is
0.5 MHz. There is no minimum SCK frequency.
In master mode, the format is identical except that the SCK pin is an
output and the shift clock now originates internally. The master mode
transmission frequency is fixed at E/4.
8-BIT SHIFT REGISTER
D
Q
R
C
RESET
SDO
SCK
SDI
MSB/LSB MASK OPTION
DATA BUS
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相關代理商/技術參數
參數描述
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