The 8051 Microcontroller and Embedded

Department of Computer Scien

ce and Information Engineering

National Cheng Kung University, TAIWAN

I/O HANEL

PROGRAMMING

(^8051) (8031)(89420)
P1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7RST(RXD) P3.0(TXD) P3.1
(-INT0)
P3.2
(-INT1)
P3.3 P3.4(T0) (T1) P3.5(-WR) P3.6(-RD )P3.7XTAL2XTAL1GND
VccP0.0 (AD0
)
P0.1 (AD1
)
P0.2 (AD2
)
P0.3 (AD3
)
P0.4 (AD4
)
P0.5 (AD5
)
P0.6 (AD6
)
P0.7 (AD7
)
-EA/VPPALE/PR
OG
-PSENP2.7 (A15)P2.6 (A14)P2.5 (A13)P2.4 (A12)P2.3 (A11)P2.2 (A10)P2.1 (A9)P2.0 (A8)
(^1234567891011121314151617181920)
403938373635343332 3130292827262524232221
Provides +5V supply voltage to the chip
Grond
8051 Pin DiagramP1 P3
A total of 32 pins are set aside for the four ports P0, P1, P2, P3, where each port takes 8 pins
P0 P2