AT89C2051-12SA View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT89C2051-12SA Datasheet PDF : 13 Pages
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AT89C2051
Flash Programming Modes
Mode
Write Code Data(1)(3)
RST/VPP
12V
Read Code Data(1)
Write Lock
H
Bit - 1
12V
P3.2/PROG
H
P3.3
L
P3.4
H
P3.5
H
P3.7
H
L
L
H
H
H
H
H
H
Bit - 2
12V
H
H
L
L
Chip Erase
12V
(2)
H
L
L
L
Read Signature Byte
H
H
L
L
L
L
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
PP
4-21
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