| ??? 05/05/05 18:00 Read: times |
#93024 - clear and do not fiddle Responding to: ???'s previous message |
I am using a parallel programmer for programming the chips. Do I need to program the Status bytes explicitly?
Yes, if you want them not to be in isp mode when you insert them Is it possible that the chip is going into the ISP mode straight away when plugged into the target. If yes, then how can it be avoided? If you have no "funny levels" (e.g. if you do not monkey with PSEN) the status byte determines the mode. extract from AN-461 If the Status Byte is set to zero, power-up execution starts at location 0000H which is the normal start address of the user’s application code. When the Status Byte is set to a value other than zero, the contents of the Boot Vector is used as the high byte of the execution address. So, if you program the status byte to zero and do not fiddle with PSEN you will execute the program Erik |
| Topic | Author | Date |
| Problem using 89C51RD2BN | 01/01/70 00:00 | |
| Some hints... | 01/01/70 00:00 | |
| could be the famous open pin | 01/01/70 00:00 | |
| EA is tied to VCC | 01/01/70 00:00 | |
| are they H? | 01/01/70 00:00 | |
| without 'H' | 01/01/70 00:00 | |
| AN-461 | 01/01/70 00:00 | |
| I am using a parallel programmer | 01/01/70 00:00 | |
| can the chip go into ISP mode directly | 01/01/70 00:00 | |
| clear and do not fiddle | 01/01/70 00:00 | |
Thanks, it worked | 01/01/70 00:00 |