參數(shù)資料
型號: HD4074654S
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer
中文描述: 4位單片機(jī)
文件頁數(shù): 75/109頁
文件大?。?/td> 430K
代理商: HD4074654S
HD404654 Series
75
Bit
Initial value
Read/Write
Bit name
3
Not used
2
Not used
0
0
W
SM1B0
1
Undefined
W
SM1B1
SM1B0
0
1
Serial clock division ratio
Prescaler output divided by 2
Prescaler output divided by 4
Serial mode register 1B (SM1B: $028)
SM1B1
0
1
Output level control in idle states
Low level
High level
Figure 57 Serial Mode Register 1B (SM1B)
Serial Data Register 1 (SR1L: $006, SR1U: $007):
This register has the following functions (figures 58
and 59)
Serial interface 1 transmission data write and shift
Serial interface 1 receive data shift and read
Writing data in this register is output from the SO
1
pin, LSB first, synchronously with the falling edge of
the transmit clock; data is input, LSB first, through the SI
1
pin at the rising edge of the transmit clock.
Input/output timing is shown in figure 60.
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
SR13
2
Undefined
R/W
SR12
0
Undefined
R/W
SR10
1
Undefined
R/W
SR11
Serial data register 1 (lower digit) (SR1L: $006)
Figure 58 Serial Data Register 1 (SR1L)
Bit
Initial value
Read/Write
Bit name
3
Undefined
R/W
SR17
2
Undefined
R/W
SR16
0
Undefined
R/W
SR14
1
Undefined
R/W
SR15
Serial data register 1 (upper digit) (SR1U: $007)
Figure 59 Serial Data Register 1 (SR1U)
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