參數(shù)資料
型號: μPD789415
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): 28/126頁
文件大?。?/td> 590K
代理商: ΜPD789415
28
μ
PD789415, 789416, 789417
Figure 5-3. Port Mode Register Format
1
PM27
PM47
1
PM87
1
1
PM26
PM46
1
PM86
1
1
PM25
PM45
1
PM85
1
1
PM24
PM44
1
PM84
1
PM03
PM23
PM43
PM53
PM83
PM93
PM02
PM22
PM42
PM52
PM82
PM92
PM01
PM21
PM41
PM51
PM81
PM91
PM00
PM20
PM40
PM50
PM80
PM90
PM0
PM2
PM4
PM5
PM8
PM9
7
6
5
4
3
2
1
0
Symbol
Address
When reset
R/W
FF20H
FF22H
FF24H
FF25H
FF28H
FF29H
FFH
FFH
FFH
FFH
FFH
FFH
R/W
R/W
R/W
R/W
R/W
R/W
PMmn
0
1
Pmn pin input/output mode selection
(m = 0, 2, 4, 5, 8, or 9; n = 0 to 7)
Output mode (output buffer ON)
Input mode (output buffer OFF)
(2) Pull-up resistor option registers (PU0 to PU2)
These registers are used to specify whether an internal pull-up resistor is to be used at each port. An internal
pull-up resistor can be used only for a port that is in input mode and for which the use of the internal pull-up
resistor is selected using the corresponding pull-up resistor option register. If a port is in output mode, an
internal pull-up resistor is not used with it, even if the use of an internal pull-up resistor has been specified
using the corresponding option register. The same applies when the port pin is used for a secondary
function.
PU0 to PU2 are manipulated using a 1-bit or 8-bit memory manipulation instruction.
A RESET input clears PU0 to PU2 to 00H.
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