Compatible with MCS-51 Products20K Bytes of In-System Reprogrammable Flash Memory
4V to 5.5V Operating Range
Fully Static Operation: 0 Hz to 24 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
Programmable Serial Channel
Low-power Idle and Power-down Mode
Interrupt Recovery from Power-down Mode
Hardware Watchdog Timer
Dual Data Pointer
Power-off Flag
40-pin DIP
The AT89C55 89C55 (Data Sheet) is a low-power, high-performance CMOS 8-bit microcomputerwith 20K bytes of Flash programmable and erasable read only memory. The device is manufactured 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.
