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IQ82C55AZ Datasheet(PDF) 3 Page - Intersil Corporation |
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IQ82C55AZ Datasheet(HTML) 3 Page - Intersil Corporation |
3 / 29 page 3 FN2969.10 November 16, 2006 Functional Diagram Pin Description SYMBOL TYPE DESCRIPTION VCC VCC: The +5V power supply pin. A 0.1μF capacitor between VCC and GND is recommended for decoupling. GND GROUND D0-D7 I/O DATA BUS: The Data Bus lines are bidirectional three-state pins connected to the system data bus. RESET I RESET: A high on this input clears the control register and all ports (A, B, C) are set to the input mode with the “Bus Hold” circuitry turned on. CS I CHIP SELECT: Chip select is an active low input used to enable the 82C55A onto the Data Bus for CPU communications. RD I READ: Read is an active low input control signal used by the CPU to read status information or data via the data bus. WR I WRITE: Write is an active low input control signal used by the CPU to load control words and data into the 82C55A. A0-A1 I ADDRESS: These input signals, in conjunction with the RD and WR inputs, control the selection of one of the three ports or the control word register. A0 and A1 are normally connected to the least significant bits of the Address Bus A0, A1. PA0-PA7 I/O PORT A: 8-bit input and output port. Both bus hold high and bus hold low circuitry are present on this port. PB0-PB7 I/O PORT B: 8-bit input and output port. Bus hold high circuitry is present on this port. PC0-PC7 I/O PORT C: 8-bit input and output port. Bus hold circuitry is present on this port. GROUP A PORT A (8) GROUP A PORT C UPPER (4) GROUP B PORT C LOWER (4) GROUP B PORT B (8) GROUP B CONTROL GROUP A CONTROL DATA BUS BUFFER READ WRITE CONTROL LOGIC RD WR A1 A0 RESET CS D7-D0 POWER SUPPLIES +5V GND BIDIRECTIONAL DATA BUS I/O PA7-PA0 I/O PC7-PC4 I/O PC3-PC0 I/O PB7-PB0 8-BIT INTERNAL DATA BUS 82C55A |
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