Timer interrupt 16F1827

[Macgman2000]

Hello,

I tried to copy over the interrupt register saving routines used on other 16F MCU's to the 16F1827
but it is not cooperating

I am getting errors of "symbol not previously defined" for T1CON.0 , PIE1.0 and PIR1.0 in addition
to "missing argument(s)"....what is going on?

See below


[ code]
myint

movwf wsave ; these commands are necessary to preserve registers to prevent
swapf STATUS, W ; corruption
clrf STATUS
movwf ssave
movf PCLATH, W
movwf psave




; Save and restore FSR and any other registers used
bcf T1CON.0 ; stop timer 1
bcf PIR1.0 ; clear over flow flag
movwf 00h ; load timer for 16,535 * 8 prescaler interrupt on 16 bit timer
movf TMR1H,W
movf TMR1L,W
bsf T1CON.0 ; re-enable timer 1
bcf PIE1.0 ; clear overflow flag just in case


; Restore saved registers
movf psave, W ; reload system register to previous values before interrupt was called
movwf PCLATH
swapf ssave, W
movwf STATUS
swapf wsave, F
swapf wsave, W
retfie ; Return from interrupt

endasm
[ /code]

[mackrackit]

I do not think that chip is supported by PBP.

[Macgman2000]

Actually, it is supported. I just dug through the Microchip manual and found that it automatically saves
the registers and does not need to preserve anything manually. I will try it out and let you all
know how that works.

[ScaleRobotics]

You don't actually have the chip do you? I thought those were not supposed to be out for a couple months?

Edit: Sorry, I was thinking of the 12F1822 .... waiting .... waiting...

[Bruce]

This one has been supported for some time now. I posted a code example for using the data signal modulator a while back for transmitting IR using the onboard USART here: http://www.picbasic.co.uk/forum/show...4227#post84227

[Macgman2000]

OK, this is very strange. I can not do bit wise manipulation within the inline ASM to
T1CON.0 , PIE1.0 and PIR1.0 it does not like this syntax. gggrrrr

[Bruce]

Make sure you're in the correct register banks, and it should work just fine. Show whatever code you're having issues with, and someone can probably offer help.

PIE1 is not in the same register bank as the rest of the registers you're writing to.

[Macgman2000]

Hello Bruce,

I am not doing anything that didn't work for the 16F877A. The compiler returns errors for this
code segment. These are the items it returns errors for...T1CON.0 , PIE1.0 and PIR1.0

See below.

[ code]
ASM
myint


; Save and restore FSR and any other registers used
bcf T1CON.0 ; stop timer 1
bcf PIR1.0 ; clear over flow flag
movwf 00h ; load timer for 16,535 * 8 prescaler interrupt on 16 bit timer
movf TMR1H,W
movf TMR1L,W
bsf T1CON.0 ; re-enable timer 1
bcf PIE1.0 ; clear overflow flag just in case

retfie ; Return from interrupt

endasm

[ /code]