vijayragavalu
Member level 1
at89s51 programming
hi
i would like to make own programmer for at89s51/52/53 and avr.In this serial Programming(ISP) mode i am not able read the memory,when i send read commands(as per document doc2487-command is 0x20,0x00,0x00--- 0th memory) after program enable(cmd is 0xAC,0x53,0x00, and get back 0x69).
what actualy i am getting when i read the memory is
when i read 0th memory i get back 0x00
1st memory -- 0x01
2nd memory -- 0x02
3rd memory -- 0x03
.
.
.
0xFDth memory ---0xFD
0xFEth memory --- 0xFE
0xFFth memory --- 0xFF
but my Erase cycle is working fine(when i send erase cmd 0xAC,0x80,0x00,0x00)
i dont know what is the problem please rectify it
thanks in advance
hi
i would like to make own programmer for at89s51/52/53 and avr.In this serial Programming(ISP) mode i am not able read the memory,when i send read commands(as per document doc2487-command is 0x20,0x00,0x00--- 0th memory) after program enable(cmd is 0xAC,0x53,0x00, and get back 0x69).
what actualy i am getting when i read the memory is
when i read 0th memory i get back 0x00
1st memory -- 0x01
2nd memory -- 0x02
3rd memory -- 0x03
.
.
.
0xFDth memory ---0xFD
0xFEth memory --- 0xFE
0xFFth memory --- 0xFF
but my Erase cycle is working fine(when i send erase cmd 0xAC,0x80,0x00,0x00)
i dont know what is the problem please rectify it
thanks in advance