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IC89C51A-40W Datasheet(PDF) 6 Page - Integrated Circuit Solution Inc |
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IC89C51A-40W Datasheet(HTML) 6 Page - Integrated Circuit Solution Inc |
6 / 22 page IC89C52(51)A 6 Integrated CircuitSolution Inc. MC008-0C 11/27/2001 Symbol PDIP PLCC PQFP I/O Name and Function P3.0-P3.7 10-17 11, 13-19 5, 7-13 I/O Port 3: Port 3 is an 8-bit bidirectional I/O port with internal pullups. Port 3 pins that have 1s written to them are pulled high by the internal pullups and can be used as inputs. As inputs, Port 3 pins that are externally pulled low will source current because of the internal pullups. (See DC Characteristics: IIL). Port 3 also serves the special features of the IC89C52(51)A, as listed below: 10 11 5 I RxD (P3.0): Serial input port. 11 13 7 O TxD (P3.1): Serial output port. 12 14 8 I INT0 INT0 INT0 INT0 INT0 (P3.2): External interrupt 0. 13 15 9 I INT1 INT1 INT1 INT1 INT1 (P3.3): External interrupt 1. 14 16 10 I T0 (P3.4): Timer 0 external input. 15 17 11 I T1 (P3.5): Timer 1 external input. 16 18 12 O WR WR WR WR WR (P3.6): External data memory write strobe. Program control signal while the chip programs and erases. 17 19 13 O RD RD RD RD RD (P3.7): External data memory read strobe. Program control signal while the chip programs and erases. PSEN 29 32 26 O Program Store Enable: The read strobe to external program memory. When the device is executing code from the external program memory, PSEN is activated twice each machine cycle except that two PSEN activations are skipped during each access to external data memory. PSEN is not activated during fetches from internal program memory. PSEN is an input control signal while memory program and verification. RST 9 10 4 I Reset: A high on this pin for two machine cycles while the oscillator is running resets the device. An internal resistor to VSS permits a power-on reset using only an external capacitor. A small internal resistor permits power-on reset using only a capacitor connected to VCC. RST is an input control signal during memory program and verification. XTAL 1 19 21 15 I Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator circuits. XTAL 2 18 20 14 O Crystal 2: Output from the inverting oscillator amplifier. GND 20 22 16 I Ground: 0V reference. Vcc 40 44 38 I Power Supply: This is the power supply voltage for operation. Table 1. Detailed Pin Description (continued) |
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