PIC16LC72 Microchip Technology, PIC16LC72 Datasheet - Page 19
![no-image](/images/manufacturer_photos/0/4/439/microchip_technology_sml.jpg)
PIC16LC72
Manufacturer Part Number
PIC16LC72
Description
8-Bit CMOS Microcontrollers
Manufacturer
Microchip Technology
Datasheet
1.PIC16LC72.pdf
(124 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16LC72-04/SO
Manufacturer:
Microchip Technology
Quantity:
135
Part Number:
PIC16LC72-04/SP
Manufacturer:
MIC
Quantity:
20 000
Part Number:
PIC16LC72A
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
Company:
Part Number:
PIC16LC72A-04/SO
Manufacturer:
Microchip Technology
Quantity:
5 000
Company:
Part Number:
PIC16LC72A-04I/ML
Manufacturer:
Microchip Technology
Quantity:
135
3.0
Some pins for these I/O ports are multiplexed with an
alternate function for the peripheral features on the
device. In general, when a peripheral is enabled, that
pin may not be used as a general purpose I/O pin.
Additional information on I/O ports may be found in the
PICmicro™ Mid-Range MCU Reference Manual,
DS33023.
3.1
PORTA is a 6-bit wide bi-directional port. The corre-
sponding data direction register is TRISA. Setting a
TRISA bit (=1) will make the corresponding PORTA pin
an input, i.e., put the corresponding output driver in a
hi-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.
Reading the PORTA register 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.
Pin RA4 is multiplexed with the Timer0 module clock
input to become the RA4/T0CKI pin. The RA4/T0CKI
pin is a Schmitt Trigger input and an open drain output.
All other RA port pins have TTL input levels and full
CMOS output drivers.
Other PORTA pins are multiplexed with analog inputs
and analog V
selected by clearing/setting the control bits in the
ADCON1 register (A/D Control Register1).
The TRISA register controls the direction of the RA
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.
EXAMPLE 3-1:
BCF
CLRF
BSF
MOVLW
MOVWF
1998 Microchip Technology Inc.
Note:
STATUS, RP0
PORTA
STATUS, RP0
0xCF
TRISA
I/O PORTS
PORTA and the TRISA Register
On a Power-on Reset, these pins are con-
figured as analog inputs and read as '0'.
REF
input. The operation of each pin is
INITIALIZING PORTA
;
; Initialize PORTA by
; clearing output
; data latches
; Select Bank 1
; Value used to
; initialize data
; direction
; Set RA<3:0> as inputs
; RA<5:4> as outputs
; TRISA<7:6> are always
; read as '0'.
Preliminary
FIGURE 3-1:
FIGURE 3-2:
Data
bus
WR
Port
WR
TRIS
RD PORT
To A/D Converter
Note 1: I/O pins have protection diodes to V
Data
bus
WR
TRIS
WR
PORT
RD PORT
Note 1: I/O pin has protection diodes to V
TMR0 clock input
PIC16C72 Series
V
D
D
Data Latch
TRIS Latch
SS
CK
CK
TRIS Latch
.
Data Latch
D
D
CK
CK
RD TRIS
BLOCK DIAGRAM OF
RA3:RA0 AND RA5 PINS
BLOCK DIAGRAM OF RA4/
T0CKI PIN
Q
Q
Q
Q
RD TRIS
Q
Q
Q
Q
Q
Q
EN
Schmitt
Trigger
input
buffer
Analog
input
mode
EN
D
EN
D
DS39016A-page 19
V
N
SS
V
V
P
N
SS
DD
SS
DD
I/O pin
only.
and
I/O pin
TTL
input
buffer
(1)
(1)