參數(shù)資料
型號: HD40A4639R
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計算機)
中文描述: 4位單片機(4位單片微計算機)
文件頁數(shù): 93/133頁
文件大?。?/td> 803K
代理商: HD40A4639R
HD404639R Series
93
Port Mode Register A (PMRA: $004):
This register has the following functions (figure 75).
R4
2
/SI
1
pin function selection
R4
3
/SO
1
pin function selection
R5
2
/SI
2
pin function selection
R5
3
/SO
2
pin function selection
Port mode register A (PMRA: $004) is a 4-bit write-only register, and is reset to $0 by MCU reset.
Bit
Initial value
Read/Write
Bit name
3
0
W
PMRA3
2
0
W
PMRA2
0
0
W
PMRA0
1
0
W
PMRA1
Port mode register A (PMRA: $004)
PMRA2
0
1
R5
3
/SO
2
mode selection
R5
3
SO
2
PMRA3
0
1
R5
2
/SI
2
mode selection
R5
2
SI
2
PMRA0
0
1
R4
3
/SO
1
mode selection
R4
3
SO
1
PMRA1
0
1
R4
2
/SI
1
mode selection
R4
2
SI
1
Figure 75 Port Mode Register A (PMRA)
Miscellaneous Register (MIS: $00C):
This register has the following functions (figure 76).
R4
3
/SO
1
pin PMOS control
Miscellaneous register (MIS: $00C) is a 4-bit write-only register and is reset to $0 by MCU reset.
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