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About ARM Manual

Sir,
I am trying to stude ARM.
While going through the manual, in tables i seen :
PINSEL1PinNameFunction .....................

1:0 P0.16 GPIO Port 0.16 EINT0 Match 0.2 (TIMER0) Capture 0.2 (TIMER0) 00
3:2 P0.17 GPIO Port 0.17 Capture 1.2 (TIMER1) SCK (SPI1) Match 1.2 (TIMER1) 00
5:4 P0.18 GPIO Port 0.18 Capture 1.3 (TIMER1) MISO (SPI1) Match 1.3 (TIMER1) 00
7:6 P0.19 GPIO Port 0.19 Match 1.2 (TIMER1) MOSI (SPI1) Match 1.3 (TIMER1) 00

My question is what the first column indicates (1:0,3:2)..
Regards
Arjun

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