Hi, I having the following doubts abt 8051AH: 1) Can I say Xtal 1 is the input from 8051 and Xtal 2 is the clock giving to 8051? If I wanna measure the Clock, I probe at Xtal 2 and refer to GND? 2) I using the DS5000 development board, but I wanna replace the DS5000 Chip with 8051AH, is it possible? Do 8051AH come with the bootstrap loader inside ROM? and can 8051AH communicate with hyperterminal? 3) For 8051AH, it has 4K ROM, how am I gonna download intel hex file to it? Any suggestion? Or defintely need to use emulator board from particular company? I really appreciate U can provide some tips to me...... =)
"8051AH need to be factory programmed?" Yes! That's what "ROM" means - otherwise it'd be "PROM!!" See the Data Sheet: http://www.keil.com/dd/chip/2999.htm "can we program the bootstrap loader ourself?" Of course you can - it's all just software, after all! However, to do so requires a very detailed understanding of the internal workings of the processor, its memory structure, the internal workings of the generated binary code, the download mechanism, etc, etc,... Somehow I don't think you are quite ready to tackle this just yet, eh? ;-)