PIC12F1516 MICROCHIP [Microchip Technology], PIC12F1516 Datasheet - Page 119

• Manufacturer Part Number: PIC12F1516
• Description: 28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

12.3
PORTB is a 8-bit wide, bidirectional port. The
corresponding
(Register
corresponding PORTB pin an input (i.e., put the
corresponding output driver in a High-Impedance mode).
Clearing a TRISB bit (= 0) will make the corresponding
PORTB pin an output (i.e., enable the output driver and
put the contents of the output latch on the selected pin).
Example 12-1
Reading the PORTB register
status of the pins, whereas writing to it will write to the
PORT latch. All write operations are read-modify-write
operations. Therefore, a write to a port implies that the
port pins are read, this value is modified and then written
to the PORT data latch (LATB).
The TRISB register
pin output drivers, even when they are being used as
analog inputs. The user should ensure the bits in the
TRISB register are maintained set when using them as
analog inputs. I/O pins configured as analog input always
read ‘0’.
12.3.1
The ANSELB register
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 out-
put 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 exe-
cuting read-modify-write instructions on the affected
port.
 2010 Microchip Technology Inc.
Note:
PORTB Registers
12-7). Setting a TRISB bit (= 1) will make the
ANSELB REGISTER
The ANSELB register must be initialized
to configure an analog channel as a digital
input. Pins configured as analog inputs
will read ‘0’.
shows how to initialize an I/O port.
data
(Register
direction
(Register
12-7) controls the PORTB
(Register
register
12-9) is used to
12-6) reads the
is
TRISB
Preliminary
12.3.2
Each PORTB pin is multiplexed with other functions. The
pins, their combined functions and their output priorities
are shown in
When multiple outputs are enabled, the actual pin
control goes to the peripheral with the highest priority.
Analog input and some digital input functions are not
included in the list below. These input functions can
remain active when the pin is configured as an output.
Certain digital input functions override other port
functions and are included in
TABLE 12-5:
Note 1:
PIC16(L)F1516/7/8/9
Pin Name
RB0
RB1
RB2
RB3
RB4
RB5
RB6
RB7
Priority listed from highest to lowest.
PORTB FUNCTIONS AND OUTPUT
PRIORITIES
Table
PORTB OUTPUT PRIORITY
12-5.
Function Priority
Table
RB0
RB1
RB2
CCP2
RB3
RB4
RB5
ICDCLK
RB6
ICDDAT
RB7
12-5.
DS41452B-page 119
(1)