Description

The AT89S4D12 is a low-voltage, highly integrated CMOS 8-bit microcomputer with 4K bytes of downloadable Flash program memory and 128K bytes of in-system reprogrammable Flash data memory. The device is manufactured using Atmel’s high density Flash memory technology and is compatible with the industry-standard MCS-51™ instruction set.

Features

• Compatible with MCS-51™ Products

• 128K Bytes of In-System Reprogrammable Flash data memory and 4K Bytes of Downloadable Flash Program Memory

– Endurance: 1,000 Write/Erase Cycles per Sector

– Data Retention: 10 Years

• Sector Programming: 128 Bytes/Sector

• Single 3.3V ± 10 Supply

• On-Chip 12 MHz oscillator

• Two-Level Program Memory Lock

• 256-Bytes Internal RAM

• 5 Programmable I/O Lines

• Serial Peripheral Interface (SPI) Channel

• Serial Program Downloading

• Dual Data Pointer Registers