| ??? 02/15/07 14:48 Read: times |
#133055 - yes Responding to: ???'s previous message |
Suresh R said:
So for this case the reading of instruction from External ROM would be at the rate of 1/6 of oscillator frequency(ALE strobing). Did i got that right jan. Yes, in this case, yes. In fact, except for MOVX instructions, there are always 2 fetches from the code ROM per instruction cycle, i.e. a complete ALE-/PSEN cycle takes 6 oscillator cycles (talking about the "vanilla" 12-clocker all the time). The consequence is, that some of the fetches are simply "thrown away", for example if an instruction takes 1 cycle and has 1 byte (e.g. mov a,Rx). If you are interested in more details, have a close look at the timing diagrams in the hardware part of the "bible". JW |
| Topic | Author | Date |
| 8031 memory interfacing | 01/01/70 00:00 | |
| youve just answered your own question | 01/01/70 00:00 | |
| i doubt 'movc' and 'movx' | 01/01/70 00:00 | |
| port 1 has nothing to do... | 01/01/70 00:00 | |
| Read the datasheet! | 01/01/70 00:00 | |
| step by step | 01/01/70 00:00 | |
| thanks for such a detailed Explanation Jan | 01/01/70 00:00 | |
| yes | 01/01/70 00:00 | |
Ok. I would go through it. | 01/01/70 00:00 |