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Bad example. Code:
MOVLW B'00000011'
MOVWF PORTA
will effect all 8 pins in register. Better use ANDWF, IORWF or XORWF,
depend on required value.
For example:
MOVLW B'11111100'
ANDWF PORTA will set bit 0 and bit 1 to 0 without effecting other bits.
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