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IA8255-PLC44C Datasheet(PDF) 2 Page - InnovASIC, Inc |
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IA8255-PLC44C Datasheet(HTML) 2 Page - InnovASIC, Inc |
2 / 4 page Page 2 of 4 IA8255 Advanced Information Sheet Programmable Peripheral Interface Adapter Copyright © 1999, InnovASIC Inc. Customer Specific IC Solutions The IA8255 is a programmable peripheral interface adapter mega-function designed to be functionally equivalent to the Intel 8255A and Harris 82C55A devices. This function has 24 I/O signals programmable in two groups of 12. Three modes of operation allow the following: • Basic Input/Output (Mode 0) - Port A, Port B, Port C (upper), and Port C (lower) can be independently configured as inputs or outputs to read or hold static data. Outputs are latched, but inputs are not latched. • Strobed Input/Output (Mode 1) - Port A and Port B can be independently configured as strobed input or output buses. Signals from Port C are dedicated as control signals for data handshaking. • Bidirectional Bus (Mode 2) - Port A can also be configured as a bidirectional bus, with the majority of Port C providing the control signals. In this case, Port B is still capable of implementing one of the previous described modes. A block diagram is shown in Figure 1. Functional Block Diagram Figure 1 DATA BUS BUFFER GROUP A CONTROL GROUP B CONTROL 8 BIT INTERNAL DATA BUS GROUP A PORT A (8) GROUP A PORT C UPPER (4) GROUP B PORT C LOWER (4) GROUP B PORT B (8) CONTROL REGISTER AND LOGIC A0 A1 CS_n RESET RD_n WR_n D7:D0 I/O PA7:PA0 I/O PC7:PC4 I/O PC3:PC0 I/O PB7:PB0 |
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