參數(shù)資料
型號: HD404369
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): 83/115頁
文件大?。?/td> 452K
代理商: HD404369
HD404369 Series
83
Port Mode Register A (PMRA: $004):
This register has the following functions (figure 67).
R0
1
/SI pin function selection
R0
2
/SO 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
PMRA0
0
1
R0
2
/SO Mode Selection
R0
2
SO
Port mode register A (PMRA: $004)
PMRA1
0
1
R0
1
/SI Mode Selection
R0
1
SI
PMRA2
0
1
R0
3
/TOC Mode Selection
R0
3
TOC
PMRA3
0
1
D
3
/BUZZ Mode Selection
D
3
BUZZ
Figure 67 Port Mode Register A (PMRA)
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