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8.3 Digital I/O Registers
The digital I/O registers are listed in Table 8-2.
Table 8-2. Digital I/O Registers
Port Register Short Form Address Register Type Initial State
Input P1IN 020h Read only -
Output P1OUT 021h Read/write Unchanged
Direction P1DIR 022h Read/write Reset with PUC
Interrupt Flag P1IFG 023h Read/write Reset with PUC
P1 Interrupt Edge Select P1IES 024h Read/write Unchanged
Interrupt Enable P1IE 025h Read/write Reset with PUC
Port Select P1SEL 026h Read/write Reset with PUC
Port Select 2 P1SEL2 041h Read/write Reset with PUC
Resistor Enable P1REN 027h Read/write Reset with PUC
Input P2IN 028h Read only -
Output P2OUT 029h Read/write Unchanged
Direction P2DIR 02Ah Read/write Reset with PUC
Interrupt Flag P2IFG 02Bh Read/write Reset with PUC
P2 Interrupt Edge Select P2IES 02Ch Read/write Unchanged
Interrupt Enable P2IE 02Dh Read/write Reset with PUC
Port Select P2SEL 02Eh Read/write 0C0h with PUC
Port Select 2 P2SEL2 042h Read/write Reset with PUC
Resistor Enable P2REN 02Fh Read/write Reset with PUC
Input P3IN 018h Read only -
Output P3OUT 019h Read/write Unchanged
Direction P3DIR 01Ah Read/write Reset with PUC
P3
Port Select P3SEL 01Bh Read/write Reset with PUC
Port Select 2 P3SEL2 043h Read/write Reset with PUC
Resistor Enable P3REN 010h Read/write Reset with PUC
Input P4IN 01Ch Read only -
Output P4OUT 01Dh Read/write Unchanged
Direction P4DIR 01Eh Read/write Reset with PUC
P4
Port Select P4SEL 01Fh Read/write Reset with PUC
Port Select 2 P4SEL2 044h Read/write Reset with PUC
Resistor Enable P4REN 011h Read/write Reset with PUC
Input P5IN 030h Read only -
Output P5OUT 031h Read/write Unchanged
Direction P5DIR 032h Read/write Reset with PUC
P5
Port Select P5SEL 033h Read/write Reset with PUC
Port Select 2 P5SEL2 045h Read/write Reset with PUC
Resistor Enable P5REN 012h Read/write Reset with PUC
Input P6IN 034h Read only -
Output P6OUT 035h Read/write Unchanged
Direction P6DIR 036h Read/write Reset with PUC
P6
Port Select P6SEL 037h Read/write Reset with PUC
Port Select 2 P6SEL2 046h Read/write Reset with PUC
Resistor Enable P6REN 013h Read/write Reset with PUC
333
SLAU144J–December 2004–Revised July 2013 Digital I/O
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