Post by thread:TMR1 still no luck!

I am ready to pull my hair out! I can not figure out what is wrong. It should be real simple and I am sure I missing something real stupid. When I run the following code, all I get is the one test beep. I hate to post code and say "Here, fix it", but I don't know what else to try. And sorry to those MPASM users, I use the parallax assembler. DEVICE PIC16C74,HS_OSC,WDT_OFF,PROTECT_OFF org 00h ; start vector goto Start org 04h ; interrupt vector goto ServiceInterrupts ; there are a bunch of variable definitions here ; (I din't think you needed to see those) Start call ClearRam ; clear all ram call InitPorts ; initialize ports call beep ; beep for half a second, a test beep clrf PIR1 mov INTCON,#11000000b mov T1CON, #00100001b mov PIE1, #00000001b mov TMR1H, #11111111b mov TMR1L, #00000000b ;set to interrupt after 256*4 inst cycles :loop goto :loop ; wait for int ServiceInterrupts call wait ;adds delay so that you can hear the two beeps call beep clrb TMR1IF ;clear interrupt flag retfie ; the other routines are down here, such as ClearRam,Beep ... ; I am sure those routines work. Thanks Zach

> > > DEVICE PIC16C74,HS_OSC,WDT_OFF,PROTECT_OFF > org 00h ; start vector > goto Start > org 04h ; interrupt vector > goto ServiceInterrupts > > > ; there are a bunch of variable definitions here > ; (I din't think you needed to see those) > > >Start > > call ClearRam ; clear all ram > call InitPorts ; initialize ports > call beep ; beep for half a second, a test beep > clrf PIR1 > mov INTCON,#11000000b --------------------------^ This is EEPROM interrupt enable bit. Try to set bit 5. Enjoy!

At 12:00 PM 16/05/96 GMT, you wrote: beep > clrf PIR1 > mov INTCON,#11000000b > mov T1CON, #00100001b > mov PIE1, #00000001b > mov TMR1H, #11111111b > mov TMR1L, #00000000b ;set to interrupt after 256*4 inst cycles >:loop goto :loop ; wait for int You forgot to set STATUS,RP0 for PIE1 register - it's in register bank 1 !! eg. bsf STATUS,RP0 movlw b'00000001' movwf PIE1 bcf STATUS,RP0