AT89S2051 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89S2051

8-bit Microcontroller with 2K/4K Bytes Flash

Atmel Corporation 

The on-board Flash program memory is accessible through the ISP serial interface. Holding

RST active forces the device into a serial programming interface and allows the program mem-

ory to be written to or read from, unless one or more lock bits have been activated.

2. Pin Configuration

2.1 20-lead 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 (SCK)

18 P1.6 (MISO)

17 P1.5 (MOSI)

16 P1.4

15 P1.3

14 P1.2

13 P1.1 (AIN1)

12 P1.0 (AIN0)

11 P3.7

3. Block Diagram

2 AT89S2051/S4051

3390C–MICRO–7/05

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