參數(shù)資料
型號: μPD789167Y
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(jī)微控制器(8位單片微控制器)
文件頁數(shù): 50/145頁
文件大?。?/td> 610K
代理商: ΜPD789167Y
Preliminary Product Information
49
μ
PD789166Y, 789167Y, 789176Y, 789177Y
(4) Port mode registers 2 and 3 (PM2 and PM3)
PM2 and PM3 specify whether each bit of port 2 and port 3 is used for input or output.
To use the P26/TO80 pin for timer output, the PM26 and P26 output latches must be reset to 0.
To use the P31/TO81/INTP1 pin for timer output, the PM31 and P31 output latches must be reset to 0.
To use the P33/INTP3/TO82/BZO90 pin for timer output, the PM33 and P33 output latches must be reset to 0.
PM2 and PM3 are manipulated using a 1-bit or 8-bit memory manipulation instruction.
A RESET input loads FFH into PM2 and PM3.
Figure 5-21. Format of Port Mode Register 2
PM26
0
1
P26 pin input/output mode selection
Output mode (output buffer ON)
Input mode (output buffer OFF)
1
PM26
PM25
PM24
PM23
PM22
PM21
PM20
PM2
7
6
5
4
Symbol
Address
When reset
R/W
FF22H
FFH
R/W
3
2
1
0
Figure 5-22. Format of Port Mode Register 3
PM31
0
1
P31 pin input/output mode selection
Output mode (output buffer ON)
Input mode (output buffer OFF)
1
1
1
1
PM33
PM32
PM31
PM30
PM3
7
6
5
4
Symbol
Address
When reset
R/W
FF23H
FFH
R/W
PM33
0
1
P33 pin input/output mode selection
Output mode (output buffer ON)
Input mode (output buffer OFF)
3
2
1
0
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