AVR-Chat

Looks like the M164/324/644 also have this feature, as well as pin 
compatibility with the M16/32 series.  Maybe someone was listening...


REB


Henry Carl Ott wrote:

>Toggling a pin by writing to the PIN register works on most of the NEWER 
>processors, but not all of them.
>  Does work on m48/88/168.
>  It's a neat trick. It is documented, but you have to be looking for it.
>
>-carl
>
>At 12:33 PM 6/12/2005, you wrote:
>  
>
>>Hello,
>>
>>You may be able to toggle a port bit by writing a 1 to the corresponding
>>PINx bit. I've not seen it documented anywhere except in the m2560 document.
>>You might want to try it to see if it works on all AVR processors.
>>
>>For PORTn and BITx it would be, I think...
>>
>>tgl_bit: sbi PINn,BITx
>>ret
>>
>>Jim
>>
>>----- Original Message -----
>>From: "Mark Jordan" <mark@cpovo.net>
>>To: <AVR-Chat@yahoogroups.com>
>>Sent: Sunday, June 12, 2005 5:55 AM
>>Subject: Re: [AVR-Chat] Bit logic...
>>
>>
>>    
>>
>>>Another way of toggling a PORT bit:
>>>
>>>
>>>tgl_bit: sbis PORTC, BIT
>>>rjmp sbi_bit
>>>
>>>clr_bit: cbi PORTC, BIT
>>>ret
>>>
>>>set_bit: sbi PORTC, BIT
>>>ret
>>>
>>>
>>>Mark
>>>On 12 Jun 2005 at 1:58, Roy E. Burrage wrote:
>>>
>>>      
>>>
>>>>I often have to toggle a bit and this is about as short and elegant as
>>>>        
>>>>
>>I've been
>>    
>>
>>>>able to do with the AVR.
>>>>
>>>>
>>>> Toggle_A1:             ; Toggles PB0 (A1) output state
>>>>     LDI  T1,1     ; Set bit 0 in T1
>>>>      IN   T2,PORTB
>>>>     EOR  T2,T1      ; XOR T1 and Port B (T2) to toggle PB0
>>>>     OUT  PORTB,T2
>>>>     RET
>>>>
>>>>This routine is called from the main program and could be performed a
>>>>        
>>>>
>>couple of
>>    
>>
>>>>other ways, but not anything shorter that I can see.
>>>>
>>>>With the 8x31/32 series we had the CPL operation. With the er, uh, those
>>>>        
>>>>
>>other
>>    
>>
>>>>guys...we have BTG.
>>>>
>>>>Anyone know of a shorter means, code wise, of doing this? Am I missing
>>>>something, like a single operation?
>>>>
>>>>
>>>>REB
>>>>
>>>>
>>>>        
>>>>
>
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