參數(shù)資料
型號(hào): HD404369S
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer
中文描述: 4位HMCS400系列微機(jī)
文件頁數(shù): 82/115頁
文件大?。?/td> 452K
代理商: HD404369S
HD404369 Series
82
Serial Data Register (SRL: $006, SRU: $007):
This register has the following functions (figures 64 and
65).
Transmission data write and shift
Receive data shift and read
Writing data in this register is output from the SO pin, LSB first, synchronously with the falling edge of the
transmit clock; data is input, LSB first, through the SI pin at the rising edge of the transmit clock.
Input/output timing is shown in figure 66.
Data cannot be read or written during serial data transfer. If a read/write occurs during transfer, the
accuracy of the resultant data cannot be guaranteed.
Bit
Initial value
Read/Write
Bit name
3
Undefined
R/W
SR3
2
Undefined
R/W
SR2
0
Undefined
R/W
SR0
1
Undefined
R/W
SR1
Serial data register (lower digit) (SRL: $006)
Figure 64 Serial Data Register (SRL)
Bit
Initial value
Read/Write
Bit name
3
Undefined
R/W
SR7
2
Undefined
R/W
SR6
0
Undefined
R/W
SR4
1
Undefined
R/W
SR5
Serial data register (upper digit) (SRU: $007)
Figure 65 Serial Data Register (SRU)
LSB
MSB
1
2
3
4
5
6
7
8
Transmit clock
Serial output
data
Serial input data
latch timing
Figure 66 Serial Interface Output Timing
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