[avr-gcc-list] How 2 Program Lock Bits???

[Tinggo - Santoso]

Hello, Folks,
I've been doing on Programming The AVR 20pin series like AT90S1200 & AT90S2313 
but until now I can't reach the Lock Bits for them.
For the Erase Chip & Write Fuse Bits I used the same Delay on the low pulse of 
WR\ that is 40ms, although the Datasheet told that they have a different Delay.
So I try to change my WR\ low pulse Delay for Programming the Lock Bits from 
50us to 40ms, but it's still not working.
So are there any recommend from anybody?
I've Interfaced them to AT89C51 as a Driver.
Here is my Programming Step in MCS51 asm:
.... ;From here the OE\,WR\ is High & BS,XTAL1 is Low
 SETB XA1
 CLR XA0
 MOV P0,#$20 ;Command for Erase Chip
 SETB XTAL1
 CLR XTAL1
 CLR XA1
 SETB XA0
 MOV P0,#%11111xy1 ;x=Lock Bit2 & y=Lock Bit1
 SETB XTAL1
 CLR XTAL1
 CLR WE
 ACALL DELAY40ms
 SETB WR
....

Thanks be4,
---
 Tinggo S.
 Jl.Raya Manyar Tirtomoyo K-66
  Surabaya
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