PIC16F916T-I/SS Microchip Technology, PIC16F916T-I/SS Datasheet - Page 46

• Manufacturer Part Number: PIC16F916T-I/SS
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,SSOP,28PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F916T-I/SS

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 24
• Program Memory Size: 14KB (8K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 352 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MA160011 - DAUGHTER BOARD PICDEM LCD 16F91X
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC16F913/914/916/917/946
3.2
PORTA is a 8-bit wide, bidirectional port. The
corresponding
(Register 3-3). Setting a TRISA bit (= 1) will make the
corresponding PORTA pin an input (i.e., put the
corresponding output driver in a High-Impedance mode).
Clearing a TRISA bit (= 0) will make the corresponding
PORTA pin an output (i.e., put the contents of the output
latch on the selected pin). Example 3-1 shows how to
initialize PORTA.
Five of the pins of PORTA can be configured as analog
inputs. These pins, RA5 and RA<3:0>, are configured
as analog inputs on device power-up and must be
reconfigured by the user to be used as I/O’s. This is
done by writing the appropriate values to the CMCON0
and ANSEL registers (see Example 3-1).
Reading the PORTA register (Register 3-2) reads the
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 means that the
port pins are read, this value is modified and then written
to the PORT data latch.
REGISTER 3-2:
REGISTER 3-3:
DS41250F-page 44
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-0
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-0
Note
TRISA7
R/W-x
R/W-1
RA7
1:
PORTA and TRISA Registers
TRISA<7:6> always reads ‘1’ in XT, HS and LP Oscillator modes.
data
RA<7:0>: PORTA I/O Pin bits
1 = Port pin is >V
0 = Port pin is <V
TRISA<7:0>: PORTA Tri-State Control bits
1 = PORTA pin configured as an input (tri-stated)
0 = PORTA pin configured as an output
TRISA6
R/W-x
R/W-1
RA6
PORTA: PORTA REGISTER
TRISA: PORTA TRI-STATE REGISTER
direction
W = Writable bit
‘1’ = Bit is set
W = Writable bit
‘1’ = Bit is set
IH
IL
max.
min.
register
TRISA5
R/W-x
R/W-1
RA5
is
TRISA
TRISA4
R/W-x
R/W-1
RA4
U = Unimplemented bit, read as ‘0’
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
‘0’ = Bit is cleared
TRISA3
R/W-1
R/W-x
The TRISA register controls the direction of the PORTA
pins, even when they are being used as analog inputs.
The user must ensure the bits in the TRISA register are
maintained set when using them as analog inputs. I/O
pins configured as analog inputs always read ‘0’.
EXAMPLE 3-1:
RA3
BANKSEL PORTA
CLRF
BANKSEL TRISA
MOVLW
MOVWF
CLRF
MOVLW
MOVWF
Note 1: The CMCON0 and ANSEL registers must
PORTA
07h
CMCON0
ANSEL
0F0h
TRISA
be initialized to configure an analog
channel as a digital input. Pins configured
as analog inputs will read ‘0’.
TRISA2
R/W-1
R/W-x
RA2
;
;Init PORTA
;
;Set RA<2:0> to
;digital I/O
;Make all PORTA digital I/O
;Set RA<7:4> as inputs
;and set RA<3:0> as outputs
INITIALIZING PORTA
© 2007 Microchip Technology Inc.
x = Bit is unknown
x = Bit is unknown
TRISA1
R/W-x
R/W-1
RA1
TRISA0
R/W-x
R/W-1
RA0
bit 0
bit 0