AT89C55 datasheet pdf

AT89C55 4-169 PDIP Features •Compatible with MCS-51™ Products •20K Bytes of In-System Reprogrammable Flash Memory – Endurance: 1,000 Write/Erase Cycles •Fully Static Operation: 0 Hz to 33 MHz •Three-Level Program Memory Lock •256 x 8-bit Internal RAM •32 Programmable I/O Lines •Three 16-bit Timer/Counters •Eight Interrupt Sources •Low Power Idle and Power Down Modes Description The AT89C55 is a low-power, high-performance CMOS 8-bit microcomputer with 20K bytes of Flash programmable and erasable read only memory. The device is manu- factured using Atmel’s high density nonvolatile memory technology and is compatible with the industry standard 80C51 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C55 is a powerful microcomputer which provides a highly flexible and cost effective solution to many embedded control applications. 0580D-A–12/97 8-Bit Microcontroller with 20K Bytes Flash AT89C55 Pin Configurations PQFP/TQFPPLCC (continued)

Features

• •Compatible with MCS-51™ Products
• •20K Bytes of In-System Reprogrammable Flash Memory
• •Fully Static Operation: 0 Hz to 33 MHz
• •Three-Level Program Memory Lock
• •256 x 8-bit Internal RAM
• •32 Programmable I/O Lines
• •Three 16-bit Timer/Counters
• •Eight Interrupt Sources
• •Low Power Idle and Power Down Modes