PIC16F193X Datasheet, PDF (93/418 Pages) Microchip Technology – 28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt Technology

6.3.3 ANSELB REGISTER
The ANSELB register (Register 6-10) is used to
configure the Input mode of an I/O pin to analog.
Setting the appropriate ANSELB bit high will cause all
digital reads on the pin to be read as ‘0’ and allow
analog functions on the pin to operate correctly.
The state of the ANSELB bits has no affect on digital
output functions. A pin with TRIS clear and ANSELB set
will still operate as a digital output, but the Input mode
will be analog. This can cause unexpected behavior
when executing read-modify-write instructions on the
affected port.
PIC16F193X/LF193X
REGISTER 6-9: TRISB: PORTB TRI-STATE REGISTER
R/W-1/1
TRISB7
bit 7
R/W-1/1
TRISB6
R/W-1/1
TRISB5
R/W-1/1
TRISB4
R/W-1/1
TRISB3
R/W-1/1
TRISB2
R/W-1/1
TRISB1
R/W-1/1
TRISB0
bit 0
Legend:
R = Readable bit
u = bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-0
TRISB<7:0>: PORTB Tri-State Control bit
1 = PORTB pin configured as an input (tri-stated)
0 = PORTB pin configured as an output
REGISTER 6-10: ANSELB: PORTB ANALOG SELECT REGISTER
U-0
—
bit 7
U-0
R/W-1/1
R/W-1/1
R/W-1/1
R/W-1/1
—
ANSB5
ANSB4
ANSB3
ANSB2
R/W-1/1
ANSB1
R/W-1/1
ANSB0
bit 0
Legend:
R = Readable bit
u = bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-6
bit 5-0
Unimplemented: Read as ‘0’
ANSB<5:0>: Analog Select between Analog or Digital Function on Pins RB<5:0>, respectively
0 = Digital I/O. Pin is assigned to port or digital special function.
1 = Analog input. Pin is assigned as analog input⁽¹⁾. Digital input buffer disabled.
Note 1: When setting a pin to an analog input, the corresponding TRIS bit must be set to Input mode in order to
allow external control of the voltage on the pin.
© 2008 Microchip Technology Inc.
Preliminary
DS41364A-page 91