AT89C55-16AA ATMEL [ATMEL Corporation], AT89C55-16AA Datasheet - Page 15

• Manufacturer Part Number: AT89C55-16AA
• Description: 8-Bit Microcontroller with 20K Bytes Flash
• Manufacturer: ATMEL [ATMEL Corporation]

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