參數(shù)資料
型號: μPD789407
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 30/128頁
文件大?。?/td> 607K
代理商: ΜPD789407
30
μ
PD789405, 789406, 789407
Figure 5-4. Format of Pull-Up Resistor Option Register 0
Pm internal pull-up resistor selection
Note
(m = 0 or 4)
0
0
0
PU04
0
0
0
PU00
PU0
Address
When reset
R/W
FFF7H
00H
R/W
7
6
5
4
3
2
1
0
PU0m
0
1
Internal pull-up resistor not used
Internal pull-up resistor used
Note
PU0 selects whether internal pull-up resistors are to be used in 8-bit units, except for port 0, for which
internal pull-up resistors can be used with only four bits (P00 to P03).
Caution
Bits 1, 2, 3, 5, 6, and 7 must be fixed to 0.
Figure 5-5. Format of Pull-Up Resistor Option Register 1
P2 internal pull-up resistor selection
Note
PU127 PU126 PU125 PU124 PU123 PU122 PU121 PU120
PU1
Address
When reset
R/W
FFF3H
00H
R/W
7
6
5
4
3
2
1
0
PU12m
0
1
Internal pull-up resistor not used
Internal pull-up resistor used
Note
PU1 selects whether internal pull-up resistors are to be used in 1-bit units.
Figure 5-6. Format of Pull-Up Resistor Option Register 2
Pm internal pull-up resistor selection
Note
(m = 8 or 9; n = 0, 2, 4, or 6)
0
0
PU292 PU290 PU286 PU284 PU282 PU280
PU2
Address
When reset
R/W
FFF4H
00H
R/W
7
6
5
4
3
2
1
0
PU2mn
0
1
Internal pull-up resistor not used
Internal pull-up resistor used
Note
PU2 selects whether internal pull-up resistors are to be used in 2-bit units (bit n and bit n+1).
Caution
Bits 6 and 7 must be fixed to 0.
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