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HS1-82C55ARH Datasheet(PDF) 2 Page - Intersil Corporation |
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HS1-82C55ARH Datasheet(HTML) 2 Page - Intersil Corporation |
2 / 23 page 971 HS-82C55ARH Pin Description SYMBOL PIN NUMBERS TYPE DESCRIPTION PA0-7 1-4, 37-40 I/O Port A: General purpose I/O Port. Data direction and mode is determined by the contents of the Control Word. PB0-7 18-25 I/O Port B: General purpose I/O port. See Port A. PC0-3 14-17 I/O Port C (Lower): Combination I/O port and control port associated with Port B. See Port A. PC4-7 10-13 I/O Port C (Upper): Combination I/O Port and control port associated with Port A. See Port A. D0-7 27-34 I/O Bidirectional Data Bus: Three-State data bus enabled as an input when CS and WR are low and as an output when CS and RD are low. VDD 26 I VDD: The +5V power supply pin. A 0.1 µF capacitor between pins 26 and 7 is recommend- ed for decoupling. GND 7 I Ground. CS 6 I Chip Select: A “low” on this input pin enables the communication between the HS-82C55ARH and the CPU. RD 5 I Read: A “low” on this input pin enables the HS-82C55ARH to send the data or status information to the CPU on the data bus. In essence, it allows the CPU to “read from” the HS-82C55ARH. WR 36 I Write: A “low” on this input pin enables the CPU to write data or control words into the HS-82C55ARH. A0 and A1 8, 9 I Port Select 0 and Port Select 1: These input signals, in conjunction with the RD and WR inputs, control the selection of one of the three ports or the control word registers. They are normally connected to the Least Significant Bits of the address bus (A0 and A1). Reset 35 I Reset: A “high” on this input clears the control register and all ports (A, B, C) are set to the input mode. “Bus hold” devices internal to the HS-82C55ARH will hold the I/O port inputs to a logic “1” state with a maximum hold current of 400 µA. Functional Diagram GROUP A CONTROL POWER SUPPLIES DATA BUS BUFFER GROUP B CONTROL READ/WRITE CONTROL LOGIC RD WR A1 A0 RESET CS D7 - D0 BIDIRECTIONAL DATA BUS +5V GND 8-BIT INTERNAL DATA BUS GROUP B PORT B (8) GROUP B PORT C LOWER (4) GROUP A PORT C UPPER (4) GROUP A PORT A (8) I/O PA7 - PA0 I/O PC7 - PC4 I/O PC3 - PC0 I/O PB7 - PB0 Spec Number 518060 |
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