PIC16F631_08 Datasheet, PDF (72/306 Pages) Microchip Technology – 20-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F631/677/685/687/689/690
REGISTER 4-8: TRISB: PORTB TRI-STATE REGISTER
R/W-1
R/W-1
R/W-1
R/W-1
U-0
U-0
U-0
U-0
TRISB7
TRISB6
TRISB5
TRISB4
—
—
—
—
bit 7
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-4
bit 3-0
TRISB<7:4>: PORTB Tri-State Control bit
1 = PORTB pin configured as an input (tri-stated)
0 = PORTB pin configured as an output
Unimplemented: Read as ‘0’
REGISTER 4-9: WPUB: WEAK PULL-UP PORTB REGISTER
R/W-1
R/W-1
R/W-1
R/W-1
U-0
U-0
WPUB7
WPUB6
WPUB5
WPUB4
—
—
bit 7
U-0
U-0
—
—
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-4
WPUB<7:4>: Weak Pull-up Register bit
1 = Pull-up enabled
0 = Pull-up disabled
bit 3-0
Unimplemented: Read as ‘0’
Note 1: Global RABPU bit of the OPTION register must be enabled for individual pull-ups to be enabled.
2: The weak pull-up device is automatically disabled if the pin is in Output mode (TRISB<7:4> = 0).
REGISTER 4-10: IOCB: INTERRUPT-ON-CHANGE PORTB REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
U-0
U-0
U-0
IOCB7
IOCB6
IOCB5
IOCB4
—
—
—
bit 7
U-0
—
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-4
bit 3-0
IOCB<7:4>: Interrupt-on-Change PORTB Control bit
1 = Interrupt-on-change enabled
0 = Interrupt-on-change disabled
Unimplemented: Read as ‘0’
DS41262E-page 70
© 2008 Microchip Technology Inc.