How to change several port bits in one step?

[yfx4]

I am using a 16f628a and int clock 4MHz in assembly using MPlab 8.xx. I have 7 LEDs on PortB <1:7> and am reserving RB0 as an input for IOC. (Sounds like I know a little huh? Don't be fooled!) I want to be able to flash the lamps on 1, 3, and 6 (or 2, 4, and 7) irrespective and ignoring and not altering the status of the other LEDs.

I can:
Flashloop
bsf Portb, 1
bsf Portb, 3
bsf Portb, 6
Delay
bcf Portb, 1
bcf Portb, 3
bcf Portb, 6
Delay
goto Flashloop

Is there a way to do the bsf and bcf for all three LEDs in a single step??? Like bsf <1,3,6> or something along that line??

Thank you!

 

[upand_at_them]

Use a shadow register. The shadow register is a variable to hold the value that you want to write to the port. You update that variable (via ANDs and ORs) and then write the full value to the port.

 

[Smartie]

movlw 0b01001010
IORwf PORTB
delay
movlw 0b10110101
andwf PORTB

That just from the top of my head, but should be correct, give it a try

Cheers
Roman

 

[yfx4]

Thanks!! I'll plug it in tonight.