PIC16F1947-I/PT Microchip Technology Inc., PIC16F1947-I/PT Datasheet - Page 130

• Manufacturer Part Number: PIC16F1947-I/PT
• Description: 64 TQFP 10x10x1mm TRAY28KB Flash, 1KB RAM, 256B EEPROM, LCD, 1.8-5.5V
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F1947-I/PT

• A/d Inputs: 17-Channel, 10-Bit
• Comparators: 3
• Cpu Speed: 8 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 54
• Interface: CAN/I2C/SPI/UART/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 64-pin TQFP
• Programmable Memory: 28K Bytes
• Ram Size: 1K Bytes
• Speed: 32 MHz
• Timers: 4-8-bit, 1-16-bit
• Voltage, Range: 1.8-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC16F/LF1946/47
12.3
PORTB is an 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 12-2
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
Each of the PORTB pins has an individually configurable
internal weak pull-up. Control bits WPUB<7:0> enable or
disable each pull-up (see
pull-up is automatically turned off when the port pin is
configured as an output. All pull-ups are disabled on a
Power-on Reset by the WPUEN bit of the OPTION
register.
12.3.2
All of the PORTB pins are individually configurable as
an interrupt-on-change pin. Control bits IOCB<7:0>
enable or disable the interrupt function for each pin.
The interrupt-on-change feature is disabled on a
Power-on
“Interrupt-On-Change”
EXAMPLE 12-2:
DS41414B-page 130
BANKSEL
CLRF
BANKSEL
CLRF
BANKSEL
MOVLW
MOVWF
PORTB Registers
12-7). Setting a TRISB bit (= 1) will make the
PORTDB;
PORTB
LATDB
LATB
TRISD
B'11110000' ;Set RD<7:4> as inputs
TRISD
WEAK PULL-UPS
INTERRUPT-ON-CHANGE
shows how to initialize PORTB.
Reset.
data
(Register
INITIALIZING PORTB
direction
for more information.
Reference
;Init PORTD
;Data Latch
;
;
;and set RD<3:0> as
;outputs
Register
12-7) controls the PORTB
(Register
register
12-9). Each weak
12-6) reads the
Section 13.0
is
TRISB
Preliminary
12.3.3
Each PORTB pin is multiplexed with other functions. The
pins, their combined functions and their output priorities
are briefly described here. For additional information,
refer to the appropriate section in this data sheet.
When multiple outputs are enabled, the actual pin
control goes to the peripheral with the lowest number in
the following lists.
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, such as the EUSART RX
signal, override other port functions and are included in
the priority list.
RB0
1.
2.
3.
4.
RB1
1.
RB2
1.
RB3
1.
RB4
1.
RB5
1.
2.
RB6
1.
2.
3.
RB7
1.
2.
3.
SEG30 (LCD)
FLT0 (CCP)
SRI (SR Latch)
INT
SEG8 (LCD)
SEG9 (LCD)
SEG10 (LCD)
SEG11 (LCD)
SEG29 (LCD)
T1G (TMR1)
ICSPCLK (Programming)
ICDCLK (enabled by Configuration Word)
SEG38 (LCD)
ICSPDAT (Programming)
ICDDAT (enabled by Configuration Word)
SEG39 (LCD)
PORTB FUNCTIONS AND OUTPUT
PRIORITIES
 2010 Microchip Technology Inc.