PIC16F1947-I/PT Microchip Technology Inc., PIC16F1947-I/PT Datasheet - Page 142

• 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
12.7
PORTF is a 8-bit wide, bidirectional port. The
corresponding
(Register
corresponding PORTF pin an input (i.e., put the
corresponding output driver in a High-Impedance mode).
Clearing a TRISF bit (= 0) will make the corresponding
PORTF pin an output (i.e., enable the output driver and
put the contents of the output latch on the selected pin).
Example 12-4
Reading the PORTF 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 (LATF).
The TRISF register
PORTF pin output drivers, even when they are being
used as analog inputs. The user should ensure the bits
in the TRISF register are maintained set when using
them as analog inputs. I/O pins configured as analog
input always read ‘0’.
12.7.1
The ANSELF register
configure the Input mode of an I/O pin to analog.
Setting the appropriate ANSELF 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 ANSELF 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.
EXAMPLE 12-6:
DS41414B-page 142
BANKSEL
CLRF
BANKSEL
CLRF
BANKSEL
CLRF
BANKSEL
MOVLW
MOVWF
Note:
PORTF Registers
12-21). Setting a TRISF bit (= 1) will make the
PORTF
PORTF
LATF
LATF
ANSELF
ANSELF
TRISF
B'11110000' ;Set RF<7:4> as inputs
TRISF
ANSELF REGISTER
The ANSELF 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 PORTF.
data
INITIALIZING PORTF
direction
(Register
(Register
;
;Init PORTF
;Data Latch
;
;
;digital I/O
;
;and set RF<3:0> as
;outputs
(Register
12-14) controls the
register
12-23) is used to
12-13) reads the
is
TRISF
Preliminary
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