| ??? 03/23/06 14:29 Read: times |
#112868 - the best I recall Responding to: ???'s previous message |
I was on the "chip selection committee" when a compny was to introduce a series of postal scales, the low end models powered by a '51, the high end powered by "a" 16 bitter.
Intel presented "we are compatible" Philips presented "we are source compatible" Siemens presented "the next step ahead" In the end we realized that "compatibility" was only interesting as far as port structure (who in his right mind would run a 16 bitter in 8 bit mode) and chose the XA - the first processor I have seen with "C opcodes" (the opcode structure is ddd xxx[yyy], zzz[www]). If I recall (this is 10+ years ago) all 3 chips were compatible as far as port functionality which was what we needed since some peripherals were to be the same as for the '51 versions. So, as stated before, if a chip has '51 type ports, it can be used without any change to the peripherals which is compatibility level 1. The (source code) compatibilty is a joke, if you use it you pay for a 16 bitter and get the use of an 8 bitter. Erik |
| Topic | Author | Date |
| the unofficial history of 8051 | 01/01/70 00:00 | |
| Need For Speed | 01/01/70 00:00 | |
| AT89LP | 01/01/70 00:00 | |
| There was a time ... | 01/01/70 00:00 | |
| which table? | 01/01/70 00:00 | |
| omissions | 01/01/70 00:00 | |
| re datasheets | 01/01/70 00:00 | |
| please suggest | 01/01/70 00:00 | |
| Competition | 01/01/70 00:00 | |
| AVR instruction set | 01/01/70 00:00 | |
| even better | 01/01/70 00:00 | |
| thanks Erik. | 01/01/70 00:00 | |
| 16-bitters | 01/01/70 00:00 | |
| the best I recall | 01/01/70 00:00 | |
| hmmm.... | 01/01/70 00:00 | |
| there is the ports | 01/01/70 00:00 | |
| but the ports... | 01/01/70 00:00 | |
| Same instruction set? | 01/01/70 00:00 | |
| far from it... | 01/01/70 00:00 | |
| Vote to Kick it out. | 01/01/70 00:00 | |
Thanks. | 01/01/70 00:00 |