| ??? 01/04/13 23:53 Read: times |
#189072 - Try a sanity check pin toggle Responding to: ???'s previous message |
Steph Ru said:
Jim/Erik,
However, I couldn't get the RC (no X2 to worry about) to run at all (can't remember if I had it running when I was last working on it). I thought it might have been a security issue (at a certain level of lock/security, the CPU won't execute from ext FLASH). I went thru and did a program of FFs as well as a complete erase and made sure the lock bits were disabled. Nothing helped, tho. Could be a dud device ? Try a simple 2 line toggle-pin pgm loop in both internal and external memory. (use a different pin) which should tell you if the part is coming out of reset, and if so, where from. Steph Ru said:
..I'm running ext code for now and will eventually move to on-chip FLASH when I have the s/w fairly well written and debugged (Why I could use the 80C31 to test). Unless you have a ROM emulator system, it is probably faster to use a device with Boot load for development ? |
| Topic | Author | Date |
| 80C52 vs. AT89C51RC vs. AT89C51RC2 | 01/01/70 00:00 | |
| pointers to check in the datasheets | 01/01/70 00:00 | |
| Check Atmel for 'migrating' docs | 01/01/70 00:00 | |
| 80C52 vs. AT89C51RC vs. AT89C51RC2 | 01/01/70 00:00 | |
Try a sanity check pin toggle  | 01/01/70 00:00 |