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89C1051U

8-Bit Microcontroller with 1K Bytes Flash

Atmel Corporation 

Features

• Compatible with MCS-51™ Products

• 1K Bytes of Reprogrammable Flash Memory

– Endurance: 1,000 Write/Erase Cycles

• 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

Description

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 nonvolatile

memory technology and is compatible with the industry standard MCS-51™ instruction

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.

Pin Configuration

PDIP/SOIC

RST/VPP 1

(RXD) P3.0 2

(TXD) P3.1 3

XTAL2 4

XTAL1 5

(INT0) P3.2 6

(INT1) P3.3 7

(T0) P3.4 8

(T1) P3.5 9

GND 10

20 VCC

19 P1.7

18 P1.6

17 P1.5

16 P1.4

15 P1.3

14 P1.2

13 P1.1 (AIN1)

12 P1.0 (AIN0)

11 P3.7

8-Bit

Microcontroller

with 1K Bytes

Flash

AT89C1051U

Preliminary

Rev. 1045A–05/98

1

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