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AT89C2051-12SC Datasheet(PDF) 7 Page - ATMEL Corporation

Part No. AT89C2051-12SC
Description  8-bit Microcontroller with 2K Bytes Flash
Download  15 Pages
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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AT89C2051-12SC Datasheet(HTML) 7 Page - ATMEL Corporation

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AT89C2051
7
Notes:
1. The internal PEROM address counter is reset to 000H on the rising edge of RST and is advanced by a positive pulse at
XTAL 1 pin.
2. Chip Erase requires a 10 ms PROG pulse.
3. P3.1 is pulled Low during programming to indicate RDY/BSY.
Figure 3. Programming the Flash Memory
Figure 4. Verifying the Flash Memory
Flash Programming Modes
Mode
RST/VPP
P3.2/PROG
P3.3
P3.4
P3.5
P3.7
Write Code Data
(1)(3)
12V
L
H
H
H
Read Code Data
(1)
HH
L
L
H
H
Write Lock
Bit - 1
12V
H
H
H
H
Bit - 2
12V
H
H
L
L
Chip Erase
12V
H
L
L
L
Read Signature Byte
H
H
L
L
L
L
(2)
PP


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