参数资料
型号: m789436
厂商: NEC Corp.
元件分类: 8位微控制器
英文描述: 8-Bit Single-Chip Microcontrollers
中文描述: 8位单芯片微控制器
文件页数: 27/144页
文件大小: 1378K
代理商: M789436
CHAPTER 6 16-BIT TIMER
User’s Manual U15075EJ1V0UM00
122
(3)
Port mode register 2 (PM2)
PM2 is used to set each bit of port 3 to input or output.
When pin P26/ITO90 is used for timer output, reset the output latch of P26 and PM26 to 0; when pin
P21/BZO90 is used for buzzer output, reset the output latch of P26 and PM26 to 0.
PM2 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets PM2 to FFH.
Figure 6-4. Format of Port Mode Register 2
PM2n
P2n pin I/O mode (n =1, 6)
Output mode (output buffer ON)
Input mode (output buffer OFF)
0
1
PM26
PM25
PM24
PM23
PM22
PM21
PM20
PM2
Symbol
Address
After reset
R/W
FF22H
FFH
R/W
6
75
4
3
21
0
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