AT89C2051-12PU Atmel, AT89C2051-12PU Datasheet - Page 9

• Manufacturer Part Number: AT89C2051-12PU
• Description: IC 8051 MCU FLASH 2K 20DIP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C2051-12PU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 12MHz
• 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): 2.7 V ~ 6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-DIP (0.300", 7.62mm)
• Package: 20PDIP W
• Device Core: 8051
• Family Name: 89C
• Maximum Speed: 12 MHz
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 15
• Interface Type: UART
• Number Of Timers: 2
• Processor Series: AT89x
• Core: 8051
• Data Ram Size: 128 B
• Maximum Clock Frequency: 12 MHz
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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
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