| ??? 09/05/08 07:48 Read: times |
#157969 - Auto reload |
I want to reload the TH0,TL0 registers with different values for different time delays. I am defining timer 0 in mode 1 (16-bit) and timer 0 overflow interrupt .
ORG 0000H
LJMP MAIN
ORG 000BH ;INTERRUPT ROUTINE FOR TIMER0
CALL TOV
ORG 0030H
MAIN:
MOV R0,#00h
MOV R1,#00h
MOV IE,#10000010B ;ENABLE TIMER 0 INTERRUPT
MOV IP,#00000010B ;TIMER 0 HIGEST PRIORITY
MOV TMOD,#01H ;TIMER 0 IN MODE 1 16-BIT TIMER
MOV TL0,#R0
MOV TH0,#R1
Update:
;routine to change the value of r0 and r1
ajmp update
TOV:
CLR TRO ;????????
MOV TL0,R0
MOV TH0,R1
SETB TR0 ;????????
RETI
END
Is it necessary to use the instructions clr TR0 and setb TR0 to resart the timer with new timer values. |
| Topic | Author | Date |
| Auto reload | 01/01/70 00:00 | |
| See any potential problems? | 01/01/70 00:00 | |
| Enable interrupts last | 01/01/70 00:00 | |
| RE: | 01/01/70 00:00 | |
| this may, some day, bite you in your lagest muscle | 01/01/70 00:00 | |
| also may, some day, bite you in your lagest muscle | 01/01/70 00:00 | |
| CALL or JMP | 01/01/70 00:00 | |
| good catch | 01/01/70 00:00 | |
| RE: | 01/01/70 00:00 | |
find out | 01/01/70 00:00 | |
| Remember the update | 01/01/70 00:00 | |
| So, what the final answer ? | 01/01/70 00:00 | |
| diplomatic answer - OK and the direct too | 01/01/70 00:00 | |
| care with multi-read/multi-write of running timers | 01/01/70 00:00 | |
| Re:problem with updating a 16-bit counter | 01/01/70 00:00 | |
| If you knew that.................. | 01/01/70 00:00 | |
| RE:If you knew that.................. | 01/01/70 00:00 |