| ??? 07/18/10 06:01 Read: times |
#177357 - ISP Responding to: ???'s previous message |
Nathan Spinuzzi said:
I have one each: D87C52EBP, D80C31F-1, D80C49, 48, 39, and uPD7810.
Which would be the most versatile for running programs from external memory, and ISP? I don't know about the 804x and uPD7810, but neither the 8752 (UV-EPROM) nor 8031 (ROMLESS) is going to be particularly versatile for ISP This is because the 8051 has a Harvard architecture - separate code & data memories - and has no means to write to its Code memory. Therefore, you'd have to do nasty hardware tricks to make it behave as a Von Neumann architecture. http://www.keil.com/support/docs/3445.htm Of course, this was common enough 20+ years ago (before ISP chips came along) - so you'll need to look out some contemporary books, designs, etc to go with your ancient chips! |
| Topic | Author | Date |
| Is a PD78312A better than an 8051? | 01/01/70 00:00 | |
| yes it is if ... no it is not if... | 01/01/70 00:00 | |
| ROM Based | 01/01/70 00:00 | |
| Thanks | 01/01/70 00:00 | |
| Study the datasheets | 01/01/70 00:00 | |
| regular & slave | 01/01/70 00:00 | |
| ISP | 01/01/70 00:00 | |
| RD and PSEN | 01/01/70 00:00 | |
| Yes, that's the kind of trick... | 01/01/70 00:00 | |
| 1 M-bit memory | 01/01/70 00:00 | |
| One step at a time | 01/01/70 00:00 | |
| 17 address lines | 01/01/70 00:00 | |
| Wear | 01/01/70 00:00 | |
Maybe FRAM would solve that problem | 01/01/70 00:00 |