| ??? 01/26/06 13:34 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#108354 - ENBOOT Responding to: ???'s previous message |
hi,
Matthias Arndt said:
I tried loading a brutal launch of the bootloader code into the flash (meaning LJMP 0F800h at 0h) but I still get no response from the bootloader.
Simple jump may be not enough. FM1 mapped between F800h and FFFFh when bit ENBOOT is set in AUXR1 register. Please note that AUXR1 bit ENBOOT is initialized at reset with the content of the BLJB bit inverted. For the bootloader condition on P1: P1.1 to P1.7 connected to +5V, P1.0 connected to GND to form FEh on P1.
Once again: The BLJB must ba at 0 (programmed) to be able to restart the bootloader. If the BLJB is equal to 1 (unprogrammed) only the hardware parallel programmer can change this bit. So what is about BLJB bit state? Regards, Oleg |
| Topic | Author | Date |
| T89C51CC02 UART Bootload not responding | 01/01/70 00:00 | |
| ENBOOT | 01/01/70 00:00 | |
| thanks... | 01/01/70 00:00 | |
| baudrates | 01/01/70 00:00 | |
point taken... | 01/01/70 00:00 |