AT89C2051X2 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89C2051X2

8-bit Microcontroller with 2K Bytes Flash

Atmel Corporation 

Features

• Compatible with MCS®-51 Products

• 2K Bytes of Reprogrammable Flash Memory

– Endurance: 1,000 Write/Erase Cycles

• 2.7V to 6V Operating Range

• Fully Static Operation: 0 Hz to 16 MHz

• Two-level Program Memory Lock

• 128 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

• 6 Clocks per Machine Cycle Operation

Description

The AT89C2051x2 is a low-voltage, high-performance CMOS 8-bit microcontroller

with 2K bytes of Flash programmable memory. The device is manufactured using

Atmel’s high-density nonvolatile memory technology and is compatible with the indus-

try-standard MCS-51 instruction set. By combining a versatile 8-bit CPU with Flash on

a monolithic chip, the Atmel AT89C2051x2 is a powerful microcomputer which pro-

vides a highly-flexible and cost-effective solution to many embedded control

applications.

The AT89C2051x2 provides the following standard features: 2K bytes of Flash, 128

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 AT89C2051x2 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.

Furthermore, the AT89C2051x2 executes one machine cycle in 6 clock cycles, provid-

ing twice the speed of the AT89C2051 device. The user gains the flexibility to divide

input frequency crystals by 2 (using less expensive components), while keeping the

same CPU power. Alternatively, the user can save on power consumption while keep-

ing the same CPU power (oscillator power saving).

8-bit

Microcontroller

with 2K Bytes

Flash

AT89C2051x2

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

Rev. 3285B–MICRO–10/03

1

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