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AT89C55 データシートの表示(PDF) - Atmel Corporation

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AT89C55 Datasheet PDF : 24 Pages
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AT89C55
Flash Programming Modes
Mode
RST PSEN
Write Code Data
H
L
Read Code Data
H
L
Write Lock
Bit-1
H
L
Bit-2
H
L
Bit-3
H
L
Chip Erase
H
L
Read Signature Byte
H
L
Note: 1. Chip Erase requires a 10-ms PROG pulse.
ALE/PROG
H
(1)
H
EA/VPP
H/12V
H
H/12V
H/12V
H/12V
H/12V
H
P2.6
L
L
H
P2.7
H
L
H
P3.6
H
H
H
P3.7
H
H
H
H
H
L
L
H
L
H
L
H
L
L
L
L
L
L
L
4-183

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