Pin | Pin Name | Description |
1 - 8 | P1.0 – P1.7 | Bi-directional I/O pins |
9 | RST | Reset Input pin |
10 | P3.0(RXD) | Bi-directional I/O and data receive pin when used for serial communication. |
11 | P3.1(TXD) | Bi-directional I/O and data transmit pin when used for serial communication. |
12 | P3.2(INT0) | Bi-directional I/O and external interrupt-0 pin |
13 | P3.3(INT1) | Bi-directional I/O and external interrupt-1 pin |
14 | P3.4(T0) | Bi-directional I/O and Counter input for Timer-0 |
15 | P3.5(T0) | Bi-directional I/O and Counter input for Timer-1 |
16 | P3.6(/WR) | Bi-directional I/O and external Memory write pin |
17 | P3.7(/RD) | Bi-directional I/O and external Memory read pin |
18 | XTL2 | External Crystal Pin 2 |
19 | XTL1 | External Crystal Pin 1 |
20 | GND | Ground |
21-28 | P2.0(A8)-P2.7(A15) | Bi-directional I/O pins and provides High Address Byte for external Memory |
29 | /PSEN | Program store enable pin |
30 | ALE(PROG) | Address latch enable pin, used to latch lower address byte for external memory |
31 | /EA | External access enable pin, should be connected to VCC |
32-39 | P0.7(A0)-P0.0(A7) | Bi-directional I/O pins and provides Lower Address Byte for external Memory |
40 | VCC | Operating Voltage(4V to 6V) |
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