參數(shù)資料
型號(hào): HD404639R
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計(jì)算機(jī))
中文描述: 4位單片機(jī)(4位單片微計(jì)算機(jī))
文件頁數(shù): 96/133頁
文件大小: 803K
代理商: HD404639R
HD404639R Series
96
Bit
Initial value
Read/Write
Bit name
3
Not used
2
0
W
SM2B2
0
0
W
SM2B0
1
Undefined
W
SM2B1
SM2B2
0
1
R5 /SO PMOS
On
Serial mode register 2B (SM2B: $01C)
SM2B1
0
1
Output level control in idle states
Low level
High level
SM2B0
0
1
Transmit clock division ratio
Prescaler output divided by 2
Prescaler output divided by 4
Off
Figure 78 Serial Mode Register 2B (SM2B)
Serial Data Register 2 (SR2L: $01D, SR2U: $01E):
This register has the following functions (figures 79
and 80).
Serial interface 2 transmission data write and shift
Serial interface 2 receive data shift and read
Writing data in this register is output from the SO
2
pin, LSB first, synchronously with the falling edge of
the transmit clock; data is input, LSB first, through the SI
2
pin at the rising edge of the transmit clock.
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
SR23
2
Undefined
R/W
SR22
0
Undefined
R/W
SR20
1
Undefined
R/W
SR21
Serial data register 2 (lower digit) (SR2L: $01D)
Figure 79 Serial Data Register 2 (SR2L)
相關(guān)PDF資料
PDF描述
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