PIC16LF720_11 Datasheet, PDF (49/244 Pages) Microchip Technology – 20-Pin Flash Microcontrollers with nanoWatt XLP Technology

PIC16(L)F720/721
REGISTER 6-4:
U-0
—
bit 7
IOCA: INTERRUPT-ON-CHANGE PORTA REGISTER
U-0
R/W-0
R/W-0
R/W-0
R/W-0
—
IOCA5
IOCA4
IOCA3
IOCA2
R/W-0
IOCA1
R/W-0
IOCA0
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 7-6
Unimplemented: Read as ‘0’
bit 5-0
IOCA<5:0>: Interrupt-on-Change PORTA Control bits
1 = Interrupt-on-change enabled⁽¹⁾
0 = Interrupt-on-change disabled
Note 1: Interrupt-on-change also requires that the RABIE bit of the INTCON register be set.
6.1.3 ANSELA REGISTER
The ANSELA register (Register 6-5) is used to
configure the Input mode of an I/O pin to analog.
Setting the appropriate ANSELA 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 ANSELA bits has no affect on digital
output functions. A pin with TRIS clear and ANSEL 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.
REGISTER 6-5: ANSELA: PORTA ANALOG SELECT REGISTER
U-0
—
bit 7
U-0
U-0
R/W-1
U-0
R/W-1
—
—
ANSA4
—
ANSA2
R/W-1
ANSA1
R/W-1
ANSA0
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 7-5
bit 4
bit 3
bit 2-0
Unimplemented: Read as ‘0’
ANSA: Analog Select between Analog or Digital Function on Pin RA<4>
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 is disabled.
Unimplemented: Read as ‘0’
ANSA<2:0>: Analog Select between Analog or Digital Function on Pins RA<2:0>, 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 is disabled.
Note 1: Setting a pin to an analog input automatically disables the digital input circuitry. Weak pull-ups, if
available, are unaffected. The corresponding TRIS bit must be set to Input mode by the user in order to
allow external control of the voltage on the pin.
 2011 Microchip Technology Inc.
Preliminary
DS41430B-page 49