The SPI Serial downloader provides a simple means to write the hex codeinto 89S8252 and 89S53. This page however, provides parallel programmingfor those who built their own Easy-Downloader V2.0. I have read detailsof parallel programming of both chips. Most of the mode setting arethe same as for 89C52 (8KB) and 89C55 (20KB), except for getting signaturebyte and read byte, the EA pin must be +12V instead of +5V. Also thesignature byte of both chips differ from 89C52 and 89C55, i.e., for 8252it was 0x72 and 89S53 was 0x53.
I thought without any modifications of theWindow version EZ3, I may send the signature byte with 0x55 for 8252 and89S53, so the Uploader EZ will recognize both chips.
For blank test, however, this job will do by theprogrammer board, i.e., for 8252 will check both 8KB code memory and 2KBEEPROM data memory (0000H-27FFH). Also for 89S53 but the code space isnow for blank test is only 12KB (0000H-2FFFH) instead of 20KB as providedin 89C55. So for now with the EZ3and 8252 or 89S53 chip in ZIF, the EZ3 will show "found 89C55", say.
Care should be taken only the memory size, mustbe in the size of chip we need to program, say 8KB code, 2KB data for 8252and 12KB code for 89S53.
For new comer, please take a look at the simple programmer board hereEasy-Downloader V2.0
Revisedsoftware 4 December 2000: I have tested this version with 8252 chip, itworks fine, if you found any bugs, please let me know.
For now Mr.Zong is very busy. I have asked him to modify his uploaderto be worked with 89S8252 and 89S53, only to make it recognizes both chips.So far, haven't got his message yet. Please try this software beforehand.
