AT89C2051-24SJ Atmel, AT89C2051-24SJ Datasheet - Page 9

• Manufacturer Part Number: AT89C2051-24SJ
• Description: IC MCU 8BIT 2K FLASH 2.7V 20-PIN
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C2051-24SJ

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 24MHz
• Connectivity: UART/USART
• Peripherals: LED
• Number Of I /o: 15
• Program Memory Size: 2KB (2K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

12. Programming Interface
13. Flash Programming Modes
Notes:
0368H–MICRO–6/08
Mode
Write Code Data
Read Code Data
Write Lock
Chip Erase
Read Signature Byte
1. The internal PEROM address counter is reset to 000H on the rising edge of RST and is advanced by a positive pulse at
2. Chip Erase requires a 10 ms PROG pulse.
3. P3.1 is pulled Low during programming to indicate RDY/BSY.
XTAL1 pin.
(1)(3)
(1)
Every code byte in the Flash array can be written and the entire array can be erased by using
the appropriate combination of control signals. The write operation cycle is self-timed and once
initiated, will automatically time itself to completion.
Most major worldwide programming vendors offer support for the Atmel AT89 microcontroller
series. Please contact your local programming vendor for the appropriate software revision.
Bit - 1
Bit - 2
RST/VPP
12V
12V
12V
12V
H
H
P3.2/PROG
H
H
(2)
P3.3
H
H
H
L
L
L
P3.4
H
H
H
L
L
L
AT89C2051
P3.5
H
H
H
L
L
L
P3.7
H
H
H
L
L
L
9