Combine Interrupts

Hi,

I need a little help,did some one know if I can Combine this two interrupt like here:

INCLUDE "modedefs.bas"

DEFINE OSC 4
DEFINE HSER_RCSTA 90h
DEFINE HSER_TXSTA 24h
DEFINE HSER_SPBRG 25 ' 9600 Bauds
DEFINE HSER_CLROERR 1
INTCON = %11100000 ' Enable interrupts Usart and TMR0
OPTION_REG =%00000110 'Prescaler = 128



On INTERRUPT GoTo Main '''''Usart
PIE1.5 = 1
On INTERRUPT GoTo Overflow ''''''Timer0 Overflow
PIE1.0 = 1


Loop:

........
........
........

Goto Loop

Disable

Main:
.......
.......
Resume

Overlow:
.......
.......

INTCON.2=0 '''''''''''''''''''''''Clear Overflow

Resume

Thanks a lot for any answer.

Regard Pesti

You can only have 1 ON INTERRUPT handler on a 16F.

In that handler, you can monitor the different Flags associated with the different interrupts and then execute the appropriate routine.

In your case, you want TMR0 and the USART, so you need to watch for TMR0IF and RCIF.

Most people only check for the flag, but I also like to make sure the Interrupt source is Enabled too, by checking TMR0IE and RCIE. That way it will stil work according to plan when you disable/enable interrupts at random.

For your suedo code, it might look like this...

Code:

---

DEFINE OSC 4
DEFINE HSER_RCSTA 90h
DEFINE HSER_TXSTA 24h
DEFINE HSER_BAUD  9600
DEFINE HSER_CLROERR 1

PEIE  VAR INTCON.6
RCIE  VAR PIE1.5
RCIF  VAR PIR1.5
T0IE  VAR INTCON.5
T0IF  VAR INTCON.2

OPTION_REG = %00000110  ' Prescaler = 128, RB pull-ups on
PEIE = 1          ' enable Peripheral interrupts
T0IE = 1          ' enable TMR0 interrupts
RCIE = 1          ' enable USART RX interrupts

On INTERRUPT GoTo IntHandler

Loop:
    ........
    ........
    ........
Goto Loop

Disable
;___________________________________
IntHandler:
    IF RCIE and RCIF then USART_RX
    IF T0IE and T0IF then TMR0_OVR
    HIGH PORTB.0  ; indicate "Unchecked Interrupt"
Resume

;___________________________________
TMR0_OVR:
    .......
    .......

    T0IF = 0  'Clear Timer0 flag
Resume

;___________________________________
USART_RX:
    .......
    .......

    Dummy = RCREG ' Clear USART Flag by reading USART data
Resume

---

HTH,

Hi,

Thank you !

Now I understand how the Interrupts are working!

Tahnks a lot.

Regard.

Pesti.