AT89S2051 Atmel Corporation, AT89S2051 Datasheet - Page 2

• Manufacturer Part Number: AT89S2051
• Manufacturer: Atmel Corporation

Specifications of AT89S2051

• Flash (kbytes): 2 Kbytes
• Max. Operating Frequency: 24 MHz
• Cpu: 8051-12C
• Max I/o Pins: 15
• Uart: 1
• Sram (kbytes): 0.25
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 2
• Isp: SPI

2. Pin Configuration
2.1
3. Block Diagram
2
20-lead PDIP/SOIC
AT89S2051/S4051
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.
(RXD) P3.0
(INT0) P3.2
(INT1) P3.3
(TXD) P3.1
RST/VPP
(T0) P3.4
(T1) P3.5
XTAL2
XTAL1
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VCC
P1.7 (SCK)
P1.6 (MISO)
P1.5 (MOSI)
P1.4
P1.3
P1.2
P1.1 (AIN1)
P1.0 (AIN0)
P3.7
3390E–MICRO–6/08