| ??? 06/16/06 15:08 Modified: 06/16/06 15:11 Read: times |
#118422 - Re "funny pin levels" Responding to: ???'s previous message |
Erik Malund said:
Why do you change the bootvector?. If you want to enter boot by "funny pin levels" why not use the ROM ISP? for your own boot use other entry method. Erik No, the "funny pin levels" are only to have an emergency exit during developing. The custom bootloader must be placed on the last bank (0xC000) and thus the bootvector must be changed to 0xC0. The bootloader was always active on every reset for about 200ms and listen, if a secret pattern arrived. Then the bootloader can reprogram the user application at 0x0000 by using the API calls at 0xFFF0. Otherwise after the 200ms it jumps to 0x0000 to start the user application. If you know another solution, I'm interested to hear it. Peter |
| Topic | Author | Date |
| P89C668 emergency exit | 01/01/70 00:00 | |
| just a question | 01/01/70 00:00 | |
| Re "funny pin levels" | 01/01/70 00:00 | |
| the "funny pin levels" is the only time | 01/01/70 00:00 | |
| NoTouch can not help | 01/01/70 00:00 | |
| I mentioned NoTouch to show that there i | 01/01/70 00:00 | |
| P89C51RD2 | 01/01/70 00:00 | |
| Boot Vector | 01/01/70 00:00 | |
| Re: P89C668 emergency exit | 01/01/70 00:00 | |
| it works not yet !!! | 01/01/70 00:00 | |
| try it manually | 01/01/70 00:00 | |
| Now it works ! | 01/01/70 00:00 | |
| my first P89C668 is dead | 01/01/70 00:00 | |
| P89C668 EOL | 01/01/70 00:00 | |
| P89C66x to P89V66x migration | 01/01/70 00:00 | |
| Iasked a contact I have at Philips and he had no a | 01/01/70 00:00 | |
| V668 | 01/01/70 00:00 | |
| 668/669 EOL | 01/01/70 00:00 | |
| there are others | 01/01/70 00:00 | |
BV | 01/01/70 00:00 |