| ??? 01/27/06 16:42 Read: times |
#108531 - Confessions about ISP of s52 |
Hi all, in the process of building an ISP for s52, I found this by Mahmoodwas pretty useful, so I fabricated my own PCB.
I also downloaded PonyProg and IC Prog. To my bad luck, PonyProg doesnt support 89s52 currently, and IC Prog doesnt even read the signature byte of my 89s52, running at 5v, 12MHz. But the same PCB (or my own STK200 dongle) does program ATmega8535 excellently, and the connections are also intact. I have read in some post here that 89s chips dont have that much pulling capacities as AVRs, so I kept the ribbon connector to the minimum length(10cms, also some critical signals have two or more buffers in parallel), but still no success. The circuit for Atmel's ISP programmer is fairly complex, so I opted the below. This is the schematic of the circuit which I built: 
Any thoughts? Regards, Vignesh |
| Topic | Author | Date |
| Confessions about ISP of s52 | 01/01/70 00:00 | |
| I still persist on Asim Khan's prog. ! | 01/01/70 00:00 | |
| whats BAD in Atmels Adapter | 01/01/70 00:00 | |
| HC is wrong. | 01/01/70 00:00 | |
| Abhishek or me? | 01/01/70 00:00 | |
| HC and HCT | 01/01/70 00:00 | |
| Why HCT | 01/01/70 00:00 | |
| Is HCT available there? | 01/01/70 00:00 | |
| 74LS244 ? | 01/01/70 00:00 | |
| Mine works with LS | 01/01/70 00:00 | |
| Post Script Viewer. | 01/01/70 00:00 | |
| a bit more | 01/01/70 00:00 | |
| aec_isp | 01/01/70 00:00 | |
| OOps | 01/01/70 00:00 | |
| Just got an idea | 01/01/70 00:00 | |
| Other programmers | 01/01/70 00:00 | |
| Atmel ISP | 01/01/70 00:00 | |
| Good link Ijaz | 01/01/70 00:00 | |
| Yes | 01/01/70 00:00 | |
| almost same problem | 01/01/70 00:00 | |
| add pullups for OE1\ and OE2\, Resistors | 01/01/70 00:00 | |
| Thanks! | 01/01/70 00:00 | |
| reset? | 01/01/70 00:00 | |
| Reset | 01/01/70 00:00 | |
| Try this | 01/01/70 00:00 | |
| It has worked! | 01/01/70 00:00 | |
| frequency | 01/01/70 00:00 | |
| 12MHz | 01/01/70 00:00 | |
| I DEVELOPED A WINDOWS BASED ISP | 01/01/70 00:00 | |
| GUI Prog for AEC ISP Cable | 01/01/70 00:00 | |
| Some doubts | 01/01/70 00:00 | |
| Also used for CPLDs | 01/01/70 00:00 | |
| Let me not jump now | 01/01/70 00:00 | |
| Real World Experience | 01/01/70 00:00 | |
| As I said... | 01/01/70 00:00 | |
| Guys, take care... | 01/01/70 00:00 | |
| Retrospection | 01/01/70 00:00 | |
| Good Work | 01/01/70 00:00 | |
The much awaited | 01/01/70 00:00 |