INTCON or Interrupt-on-Change IOCCON ?

INTCON = 00 0 0 0 0 0 1

bit 7-6 = 0 / unimplemented
bit 5 = gpio.5
bit 4 = gpio.4
bit 3 = gpio.3
bit 2 = gpio.2
bit 1 = gpio.1
bit 0 = gpio.0

GPIO.0 = M_BUT so 1 = enable