at89c55-16qa ATMEL Corporation, at89c55-16qa Datasheet - Page 15

• Manufacturer Part Number: at89c55-16qa
• Description: 8-bit Microcontroller With Bytes Flash
• Manufacturer: 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