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

• Manufacturer Part Number: AT89C2051-12PC
• Manufacturer: Atmel

Specifications of AT89C2051-12PC

• Cpu Family: 89C
• Device Core: 8051
• Device Core Size: 8b
• Frequency (max): 12MHz
• Interface Type: UART
• Program Memory Type: Flash
• Program Memory Size: 2KB
• Total Internal Ram Size: 128Byte
• # I/os (max): 15
• Number Of Timers - General Purpose: 2
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 6V
• Operating Supply Voltage (min): 2.7V
• Instruction Set Architecture: CISC
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Pin Count: 20
• Package Type: PDIP
• Lead Free Status / Rohs Status: Not 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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