AT89C1051U-24PI

AT89C1051U-24PI Datasheet


The AT89C1051U is a low-voltage, high-performance CMOS 8-bit microcomputer with 1K byte of Flash programmable and erasable read only memory. It has the same functionality and operation as the AT89C1051 with the addition of a UART programmable 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 costeffective solution to many embedded control applications.

Part Datasheet
AT89C1051U-24PI AT89C1051U-24PI AT89C1051U-24PI (pdf)
Related Parts Information
AT89C1051U-24SC AT89C1051U-24SC AT89C1051U-24SC
AT89C1051U-24PC AT89C1051U-24PC AT89C1051U-24PC
AT89C1051U-24SI AT89C1051U-24SI AT89C1051U-24SI
AT89C1051U-12SI AT89C1051U-12SI AT89C1051U-12SI
AT89C1051U-12PC AT89C1051U-12PC AT89C1051U-12PC
AT89C1051U-12PI AT89C1051U-12PI AT89C1051U-12PI
AT89C1051U-12SC AT89C1051U-12SC AT89C1051U-12SC
PDF Datasheet Preview
• 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

The AT89C1051U is a low-voltage, high-performance CMOS 8-bit microcomputer with 1K byte of Flash programmable and erasable read only memory. It has the same functionality and operation as the AT89C1051 with the addition of a UART programmable 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 costeffective solution to many embedded control applications.

The AT89C1051U provides the following standard features 1K byte 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 operation 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.
8-bit Microcontroller with 1K Byte Flash

AT89C1051U

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 TO 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

Block Diagram

VCC GND

RAM ADDR. REGISTER

FLASH

B REGISTER

STACK POINTER

PROGRAM ADDRESS REGISTER

TMP2

TMP1

BUFFER

ALU PSW

INTERRUPT, SERIAL PORT, AND TIMER BLOCKS

TIMING AND

CONTROL

INSTRUCTION REGISTER

ANALOG COMPARATOR

PORT1 LATCH

PORT3 LATCH

PORT1 DRIVERS

PORT3 DRIVERS

PC INCREMENTER

PROGRAM COUNTER

DPTR

P1.0 - P1.7

P3.0 - P3.5

P3.7

AT89C1051U

AT89C1051U

Pin Description
Ordering Information

Speed MHz

Power Supply
2.7V to 6.0V
4.0V to 6.0V
Ordering Code

AT89C1051U-12PC AT89C1051U-12SC

AT89C1051U-12PI AT89C1051U-12SI

AT89C1051U-24PC AT89C1051U-24SC

AT89C1051U-24PI AT89C1051U-24SI

AT89C1051U

Package
20P3 20S
20P3 20S
20P3 20S
20P3 20S

Operation Range

Commercial 0°C to 70°C

Industrial -40°C to 85°C

Commercial 0°C to 70°C

Industrial -40°C to 85°C
20P3 20S

Package Type 20-lead, Wide, Plastic Dual In-line Package PDIP 20-lead, Wide, Plastic Gull Wing Small Outline SOIC

Packaging Information
20P3, 20-lead, Wide, Plastic Dual In-line Package PDIP Dimensions in Inches and Millimeters

JEDEC STANDARD MS-001 AD

SEATING PLANE
0 REF 15
20S, 20-lead, Wide, Plastic Gull Wing Small Outline SOIC Dimensions in Inches and Millimeters

PIN 1
0 REF

AT89C1051U

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e-mail

Web Site

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Datasheet ID: AT89C1051U-24PI 519078