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參數(shù)資料
型號(hào): W741C20X
廠商: WINBOND ELECTRONICS CORP
英文描述: 4-BIT MICROCONTROLLER
中文描述: 4位微控制器
文件頁數(shù): 16/84頁
文件大小: 486K
代理商: W741C20X
Preliminary W741C20X
- 16 -
Bit 0 = 0 RB.0 works as output pin; Bit 0 = 1 RB.0 works as input pin
Bit 1 = 0 RB.1 works as output pin; Bit 1 = 1 RB.1 works as input pin
Bit 2 = 0 RB.2 works as output pin; Bit 2 = 1 RB.2 works as input pin
Bit 3 = 0 RB.3 works as output pin; Bit 3 = 1 RB.3 works as input pin
At initial reset, the port RB is input mode (PM2 = 1111B).
Port Mode 3 register (PM3)
Port Mode 3 Register is organized as a 4-bit binary register (PM3.0 to PM3.3). PM3 can be used to
determine the operating mode of the output port RE and the clock rate of the serial I/O function. The
PM3 control diagram is shown in Figure 8. The bit descriptions are as follows:
W
W
0
1
2
3
PM3
Note: W means write only.
Bit 0 is reserved.
Bit 1 = 0 The output of the port RE is the output of the internal parallel port RT.
= 1 The port RE works as the serial input/output port.
Bit 2 is reserved.
Bit 3 = 0 Serial Tx rate = F
OSC
/2
= 1 Serial Tx rate = F
OSC
/256
PM3.1
MUX.
Internal parallel port RT
Port RE
Fosc/2
PM3.3
Fosc/256
Serial I/O port
Figure 8. PM3 Control Diagram
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參數(shù)描述
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