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Microcontroller Programming » Setting Pin Low

March 09, 2011
by dgikuljot
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According to the nerdkits guide this is how you set a pin to output ground or low:

 PORTC &= ~(1<<PC3);// set PC3 low

 the way i do it is : PORTC |= (0<<2).

Is my method good also, or is it bad for mcu in any way. Thanks, Kuljot Dhami

March 09, 2011
by esoderberg
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See page 58 of NK guide. Say for example PC3 is high and all else on PORTC off, then PORTC = 00000100 and what your code does is: PORTC = 00000100 | 00000000 = 00000100. IE PC3 still high, so I don't think your method will work as you intend.


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