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AT89C2051 20-Pin 24MHz 2kb Microcontroller Datasheet
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Product Details
The AT89C2051 Microcontroller IC,
originally produced by Atmel, is an 8-bit microcontroller
using the standard MCS-51 instruction set.
The AT89C2051 microcontroller features 2K bytes of Flash Program Memory,
128 bytes of RAM, 15 I/O lines, two 16-bit timer/counters and a
serial UART connection.
Features
- Compatible with MCS-51 Products
- 2K Bytes of Reprogrammable Flash Memory
- 2.7 to 6V Operating Range
- Fully Static Operation: 0 Hz to 24 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
- 20-pin PDIP
Pin Layout
Pin Description
| Pin Number | Description |
|---|---|
| 1 | RESET - Reset |
| 2 | P3.0 - Port 3 - RXD |
| 3 | P3.1 - Port 3 - TXD |
| 4 | XTAL2 - Crystal |
| 5 | XTAL1 - Crystal |
| 6 | P3.2 - Port 3 - INT0 |
| 7 | P3.3 - Port 3 - INT1 |
| 8 | P3.4 - Port 3 - TO |
| 9 | P3.5 - Port 3 - T1 |
| 10 | GND - Ground |
| 11 | P3.7 - Port 3 |
| 12 | P1.0 - Port 1 - AIN0 |
| 13 | P1.1 - Port 1 - AIN1 |
| 14 | P1.2 - Port 1 |
| 15 | P1.3 - Port 1 |
| 16 | P1.4 - Port 1 |
| 17 | P1.5 - Port 1 |
| 18 | P1.6 - Port 1 |
| 19 | P1.7 - Port 1 |
| 20 | Vcc - Positive Supply |
Dimensional Drawing
Technical Data
