AT89C1051U

Compatible with MCS-51^TM  Products
1K Bytes of Reprogrammable Flash Memory
-CEndurance: 1,000 Write/Erase Cycle
2.7V to 6V Operating Range
Fully Static Operation: 0 Hz to 24 MHz
Two-Level Program Memory Lock
64 x 8-Bit Internal RAM
15 Programmable I/O Lines
Two 16-Bit Timer/Counters
Six Interrupt Sources
Programmable Serial UART Channel
Direct LED Drive Outputs
On-Chip Analog Comparator
Low Power Idle and Power Down Modes

The AT89C1051U is a low-voltage, high-performance CMOS 8-bit microcomputer with 1K bytes of Flash programmable and erasable read only memory. It has the same functionality and operation as the AT89C1051 with the addition of a UART program- mable serial port. The device is manufactured using Atmel's high-density nonvolatil instruction memory technology and is compatible with the industry standard MCS-51^TM set. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C1051U is a powerful microcomputer which provides a highly flexible and cost effective solution to many embedded control applications.

The AT89C1051U provides the following standard features: 1K bytes of Flash, 64 bytes of RAM, 15 I/O lines, two 16-bit timer/counters, a five-vector, two-level interrupt architecture, a full duplex serial port, a precision analog comparator, on-chip oscillator and clock circuitry. In addition, the AT89C1051U is designed with static logic for oper-ation down to zero frequency and supports two software-selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port and interrupt system to continue functioning. The Power Down Mode saves the RAM contents but freezes the oscillator disabling all other chip functions until the next hardware reset.