Reading From EEPROM Memory
Setting the RD bit initializes transfer of data from address found in EEADR register to EEDATA register. As in reading data we don't need so much time as in writing, data taken over from EEDATA register can already be used further in the next instruction.
Sample of the part of a program which reads data in EEPROM, could look something like the following:
| bcf |
STATUS, |
RP0 |
;bankO, because EEADR is at 09h |
| movlw |
0x00 |
|
;address of location being read |
| movwf |
EEADR |
|
;address transferred to EEADR |
| bsf |
STATUS, |
RP0 |
;bankl because EECON1 is at 88h |
| bsf |
EECON1, |
RD |
;reading from EEFROM |
| bcf |
STATUS, |
RP0 |
;Bank0 because EEDATA is at 08h |
| movf |
EEDATA |
W |
;W< -- EEDATA |
After the last program instruction, contents from an EEPROM address zero can be found in working register w.
Keywords :
Pic,
Assembler,
Assembly,
Reading,
From,
EEPROM,
Memory
Writer : delon |
3 Mar 2006 Fri
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