PIC16F722A Datasheet, PDF (48/284 Pages) Microchip Technology – 28-Pin Flash Microcontrollers with nanoWatt XLP Technology

PIC16F/LF722A/723A
6.2 PORTA and the TRISA Registers
PORTA is a 8-bit wide, bidirectional port. The
corresponding data direction register is TRISA
(Register 6-3). Setting a TRISA bit (= 1) will make the
corresponding PORTA pin an input (i.e., disable the
output driver). Clearing a TRISA bit (= 0) will make the
corresponding PORTA pin an output (i.e., enables
output driver and puts the contents of the output latch
on the selected pin). Example 6-1 shows how to
initialize PORTA.
Reading the PORTA register (Register 6-2) 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 implies that the
port pins are read, this value is modified and then
written to the PORT data latch.
REGISTER 6-2: PORTA: PORTA REGISTER
R/W-x
RA7
bit 7
R/W-x
RA6
R/W-x
RA5
R/W-x
RA4
The TRISA register (Register 6-3) controls the PORTA
pin output drivers, even when they are being used as
analog inputs. The user should ensure the bits in the
TRISA register are maintained set when using them as
analog inputs. I/O pins configured as analog input
always read ‘0’.
Note:
The ANSELA register must be initialized to
configure an analog channel as a digital
input. Pins configured as analog inputs will
read ‘0’.
EXAMPLE 6-1: INITIALIZING PORTA
BANKSEL PORTA
CLRF PORTA
BANKSEL ANSELA
CLRF ANSELA
BANKSEL TRISA
MOVLW 0Ch
MOVWF TRISA
;
;Init PORTA
;
;digital I/O
;
;Set RA<3:2> as inputs
;and set RA<7:4,1:0>
;as outputs
R/W-x
RA3
R/W-x
RA2
R/W-x
RA1
R/W-x
RA0
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 7-0
RA<7:0>: PORTA I/O Pin bit
1 = Port pin is > VIH
0 = Port pin is < VIL
REGISTER 6-3: TRISA: PORTA TRI-STATE REGISTER
R/W-1
TRISA7
bit 7
R/W-1
TRISA6
R/W-1
TRISA5
R/W-1
TRISA4
R/W-1
TRISA3
R/W-1
TRISA2
R/W-1
TRISA1
R/W-1
TRISA0
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 7-0
TRISA<7:0>: PORTA Tri-State Control bit
1 = PORTA pin configured as an input (tri-stated)
0 = PORTA pin configured as an output
DS41417A-page 48
 2010 Microchip Technology Inc.