AT89C55WD-33AC ATMEL Corporation, AT89C55WD-33AC Datasheet - Page 26

• Manufacturer Part Number: AT89C55WD-33AC
• Description: 8-bit Microcontroller with 20K Bytes Flash
• Manufacturer: ATMEL Corporation

Flash Programming and Verification Waveforms
Lock Bit Programming
26
Lockbit_1, 2 or 3
Test Conditions
AT89C55WD
ALE/PROG
V
Data Setup
CC
P1.0 - P1.7
P2.0 - P2.5
ALE/PROG
(RDY/BSY)
(ENABLE)
= 6.5V
Setup
PORT 0
P3.0
P2.7
EA/V
P3.4
PP
t
t
SHGL
AVGL
t
EHSH
V
PROGRAMMING
PP
t
DVGL
ADDRESS
100 µs
DATA IN
t
GLGH
t
GHBL
t
GHDX
t
ELQV
t
GHAX
t
GHSL
LOGIC 1
LOGIC 0
BUSY
t
WC
VERIFICATION
DATA OUT
ADDRESS
t
AVQV
READY
V
CC
Wait 10 ms to reload
new lock bit status
= 4.5V to 5.5V
t
EHQZ
1921B–MICRO–09/02