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參數(shù)資料
型號： W741L260
廠商： WINBOND ELECTRONICS CORP
元件分類： 微控制器/微處理器
英文描述： 4-BIT MICROCONTROLLER
中文描述： 4-BIT, MROM, 1 MHz, MICROCONTROLLER, PQFP80
封裝： QFP-80
文件頁數(shù)： 20/90頁
文件大小： 480K
代理商： W741L260
W741L260
- 20 -
Port Mode 0 Register (PM0)
The port mode 0 register is organized as a 4-bit binary register (PM0.0 to PM0.3). PM0 can be used
to determine the structure of the input/output ports; it is controlled by the MOV PM0, #I instruction.
The bit descriptions are as follows:
PM0
w
w
w
0
1
2
w
3
Note: W means write only.
Bit 0 = 0 RA port is CMOS output type. Bit 0 = 1 RA port is NMOS open drain output type.
Bit 1 = 0 RB port is CMOS output type. Bit 0 = 1 RB port is NMOS open drain output type.
Bit 2 = 0 RC port pull-high resistor is disabled.
= 1 RC port pull-high resistor is enabled.
Bit 3 = 0 RD port pull-high resistor is disabled.
= 1 RD port pull-high resistor is enabled.
Port Mode 1 Register (PM1)
The port mode 1 register is organized as a 4-bit binary register (PM1.0 to PM1.3). PM1 can be used
to control the input/output mode of port RA. PM1 is controlled by the MOV PM1, #I instruction. The bit
descriptions are as follows:
PM1
w
w
w
0
1
2
w
3
Note: W means write only.
Bit 0 = 0 RA.0 works as output pin; Bit 0 = 1 RA.0 works as input pin
Bit 1 = 0 RA.1 works as output pin; Bit 1 = 1 RA.1 works as input pin
Bit 2 = 0 RA.2 works as output pin; Bit 2 = 1 RA.2 works as input pin
Bit 3 = 0 RA.3 works as output pin; Bit 3 = 1 RA.3 works as input pin
At initial reset, port RA is input mode (PM1 = 1111B).
相關(guān)PDF資料
PDF描述
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