AT89C55WD pdf datasheet

Features
? Compatible with MCS-51? Products
? 20K Bytes of Reprogrammable Flash Memory
? Endurance: 1000 Write/Erase Cycles
? 4V to 5.5V Operating Range
? 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
? Programmable Serial Channel
? Low-power Idle and Power-down Modes
? Interrupt Recovery from Power-down Mode
? Hardware Watchdog Timer
? Dual Data Pointer
? Power-off Flag
Description
The AT89C55WD is a low-power, high-performance CMOS 8-bit microcomputer with
20K bytes of Flash programmable read only memory and 256 bytes of RAM. The
device is manufactured using Atmel’s high-density nonvolatile memory technology
and is compatible with the industry standard 80C51 and 80C52 instruction set and