MSM82C55A-2GS

E2O0020-27-X3 ¡ Semiconductor MSM82C55A-2RS/GS/VJS ¡ Semiconductor CMOS PROGRAMMABLE PERIPHERAL INTERFACE This version: Jan. 1998 MSM82C55A-2RS/GS/VJS Previous version: Aug. 1996 GENERAL DESCRIPTION The MSM82C55A-2 is a programmable universal I/O interface device which operates as high speed and on low power consumption due to 3m silicon gate CMOS technology. It is the best fit as an I/O port in a system which employs the 8-bit parallel processing MSM80C85AH CPU. This device has 24-bit I/O pins equivalent to three 8-bit I/O ports and all inputs/outputs are TTL interface compatible. FEATURES High speed and low power consumption due to 3m silicon gate CMOS technology 3 V to 6 V single power supply Full static operation Programmable 24-bit I/O ports Bidirectional bus operation (Port A) Bit set/reset function (Port C) TTL compatible Compatible with 8255A-5 40-pin Plastic DIP (DIP40-P-600-2.54): (Product name: MSM82C55A-2RS) 44-pin Plastic QFJ (QFJ44-P-S650-1.27): (Product name: MSM82C55A-2VJS) 44-pin Plastic QFP (QFP44-P-910-0.80-2K): (Product name: MSM82C55A-2GS-2K) 1/26 ¡ Semiconductor MSM82C55A-2RS/GS/VJS CIRCUIT CONFIGURATION 8 VCC 8 GND 8 Group A Control 4 Group A Port C (High Order 4 Bits) 4 PC4 - PC7 Group A Port A (8) 8 PA0 - PA7 8 D 0 - D7 Data Bus Buffer 8 Internal Bus Line 4 8 RD WR RESET CS A0 A1 Read/ Write Control Logic Group B Control 8 Group B Port C (Low Order 4 Bits) 4 PC0 - PC3 Group B Port B (8) 8 PB0 - PB7 2/26 ¡ Sem...