AT89S2051 - Microcontroller Microchip - Free user manual and instructions
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| Product Type | 8-bit Microcontroller |
| Brand | Microchip (formerly Atmel) |
| Model | AT89S2051 |
| Package | 20-pin PDIP or SOIC |
| Dimensions (approx.) | 24.33 mm x 6.35 mm (PDIP) |
| Weight | Approx. 1.5 g |
| Supply Voltage | 4.0V to 5.5V |
| Maximum Clock Frequency | 33 MHz |
| Program Memory | 2 KB Flash (In-System Programmable) |
| Data Memory (RAM) | 128 bytes |
| Number of I/O Pins | 15 (including Port 0, Port 1, Port 3) |
| On-chip Peripherals | Timer/Counters (3), UART, Watchdog Timer |
| Interrupt Sources | 6 (external and internal) |
| Instruction Set | 8051-compatible |
| Operating Temperature | -40°C to +85°C |
| Power Consumption (typical) | 25 mA at 5V, 33 MHz |
| Programming Interface | SPI (In-System Programming) |
| Maintenance | No routine maintenance required; handle with ESD precautions |
| Safety | Operate within specified voltage and temperature range; avoid static discharge |
| Spare Parts / Repairability | Not field-repairable; replace microcontroller if faulty |
Frequently Asked Questions - AT89S2051 Microchip
What is the AT89S2051 microcontroller?
The AT89S2051 is an 8-bit 8051-compatible microcontroller with 2KB Flash memory, 128 bytes RAM, and 15 I/O pins, manufactured by Microchip (formerly Atmel).
What is the supply voltage range?
The recommended supply voltage is 4.0V to 5.5V. Operation outside this range may damage the device.
How do I program the AT89S2051?
It supports In-System Programming (ISP) via a 5-wire SPI interface. You can use a programmer like the Atmel ISP or a compatible device.
What is the maximum clock frequency?
The maximum clock frequency is 33 MHz when using an external crystal or oscillator.
How many I/O pins are available?
It has 15 general-purpose I/O pins arranged as Port 0 (8 pins), Port 1 (8 pins, but only 5 are usable as I/O due to alternate functions), and Port 3 (8 pins, some shared with special functions).
What are the main peripherals?
The AT89S2051 includes three 16-bit timer/counters, a full-duplex UART, and a watchdog timer.
Can I use the AT89S2051 in industrial environments?
Yes, it has an industrial temperature range of -40°C to +85°C and is suitable for many embedded applications.
How much current does it consume?
Typical power consumption is 25 mA at 5V and 33 MHz. In idle mode, consumption drops to about 6.5 mA, and in power-down mode to less than 1 µA.
Is the AT89S2051 compatible with the original 8051?
Yes, it is fully instruction-set compatible with the standard 8051, so existing 8051 code can be used without modification.
Where can I find the datasheet and user manual?
You can download the free user manual and datasheet from the Microchip website or from notice-facile.com. The manual provides detailed specifications, pinout, and programming instructions.
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USER MANUAL AT89S2051 Microchip
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Product information
Brand : Microchip
Model : AT89S2051
Category : Microcontroller