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

[Jason Kyle]

At 23:42 23/02/2002 +0700, Tinggo - Santoso wrote:
> 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

Is this a typo is it the line above meant to be CLR WR ???

>  ACALL DELAY40ms
>  SETB WR
> ....
>
> Thanks be4,
> ---
>  Tinggo S.
>  Jl.Raya Manyar Tirtomoyo K-66
>   Surabaya
>   address@hidden / address@hidden
>   / address@hidden
>  Office: +62 031 5941045
>  Home: +62 0271 647934
>  HP: +62 8123153035 / +62 811295799

Jason Kyle


avr-gcc-list at http://avr1.org