AT89C55WD View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'AT89C55WD' PDF : 35 Pages View PDF
AT89C55WD
23. Flash Programming and Verification Waveforms
P1.0 - P1.7
P2.0 - P2.5
P3.4
PORT 0
ALE/PROG
EA/VPP
P2.7
(ENABLE)
P3.0
(RDY/BSY)
PROGRAMMING
ADDRESS
tAVGL
tSHGL
DATA IN
tDVGL tGHDX
VPP
tGLGH
tEHSH
tGHBL
tGHAX
VERIFICATION
ADDRESS
tAVQV
DATA OUT
tGHSL
LOGIC 1
LOGIC 0
tELQV
BUSY
tWC
READY
tEHQZ
24. Lock Bit Programming
Test Conditions
Setup
Lockbit_1, 2 or 3
Data Setup
ALE/PROG
VCC = 6.5V
100 µs
25. Parallel Chip Erase Mode
Test Conditions
Setup
200 ns
ALE/PROG
P3<0>
VCC = 6.5V
Erase
DC
Erase
VCC = 4.5V to 5.5V
Wait 10 ms to reload
new lock bit status
Test Conditions Setup
200 ns
Erase
10 ms
DC
Erase
VCC = 4.5V to 5.5V
Wait 10 ms before
reprogramming
25
1921C–MICRO–3/05
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