| ??? 12/27/04 16:05 Read: times |
#83940 - maybe Responding to: ???'s previous message |
I am using oodles and bunches of 668s and they7 all do MOVC (table lookup) with no problems.
Two differences: 1) The '668 has 8k of internal external RAM, the RD2 has (is it 512 or 1024 bytes) far less. If you are using external addresses with internal XRAM enabled the switch to external will occur much later i.e. a device memory mapped at 4k will work on the RD2, but not on the '668. 2) the '668 is switched between 6 and 12 clock by a fuse which can only be changed by parallel programming. The V can be changed by ISP. Erik |
| Topic | Author | Date |
| P89C668 MOVC problem. | 01/01/70 00:00 | |
| Earlier discussions. | 01/01/70 00:00 | |
| Timing problem? | 01/01/70 00:00 | |
| Re: Timing Problem. | 01/01/70 00:00 | |
| How do you program? | 01/01/70 00:00 | |
| Seciurity bits. | 01/01/70 00:00 | |
| A bug in the chip? | 01/01/70 00:00 | |
| Can you give the schematic ? | 01/01/70 00:00 | |
| Schematic is here. | 01/01/70 00:00 | |
| Real code I will post tomorrow. | 01/01/70 00:00 | |
| More sacrifice needed | 01/01/70 00:00 | |
| Flash Magic | 01/01/70 00:00 | |
| Flash Magic | 01/01/70 00:00 | |
| XRAM Turn ON. | 01/01/70 00:00 | |
| I missed this - Russell. | 01/01/70 00:00 | |
| maybe | 01/01/70 00:00 | |
| Caught the cause of problem. | 01/01/70 00:00 | |
256 bytes less... | 01/01/70 00:00 |