| ??? 07/25/08 13:22 Read: times |
#157051 - More information is always helpful. Responding to: ???'s previous message |
Erik,
As I understood the question, the OP wanted to know whether anything went on to the address or data bus when you accessed the DPH and DPL registers. As far as I know, no 8051 or any variant does anything other than read /write the registers. Of course an external memory access will be dependent on the value of DPTR. But nothing happens until the external addressed instruction is executed. David. |
| Topic | Author | Date |
| DPTR to hold 16 bit address | 01/01/70 00:00 | |
| No. It is just a register. | 01/01/70 00:00 | |
| Remember that there are two data pointers | 01/01/70 00:00 | |
| let me get on my soapbox | 01/01/70 00:00 | |
| More information is always helpful. | 01/01/70 00:00 | |
| device info | 01/01/70 00:00 | |
| Is that true? | 01/01/70 00:00 | |
| Two? | 01/01/70 00:00 | |
| You can ignore multiple DPTRs | 01/01/70 00:00 | |
| Definition of "most" | 01/01/70 00:00 | |
| my take on multiple dptrs | 01/01/70 00:00 | |
| What idiot gave Lynn a -1 point?? | 01/01/70 00:00 | |
| Overreacting? | 01/01/70 00:00 | |
| Karma | 01/01/70 00:00 | |
Calm down - it's perfectly valid and correct | 01/01/70 00:00 | |
| Don\'t use any register | 01/01/70 00:00 |