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IC80C51-12PL Datasheet(PDF) 6 Page - Integrated Circuit Solution Inc |
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IC80C51-12PL Datasheet(HTML) 6 Page - Integrated Circuit Solution Inc |
6 / 44 page IC80C51 IC80C31 S3-6 Integrated Circuit Solution Inc. MC001-0B 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 IC80C51/31, 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. 17 19 13 O RD RD RD RD RD (P3.7): External data memory read strobe. 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. 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 MOS resistor to GND permits a power-on reset using only an external capaci- tor connected to Vcc. 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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