PIC16F872-I/SO Microchip Technology, PIC16F872-I/SO Datasheet - Page 31
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PIC16F872-I/SO
Manufacturer Part Number
PIC16F872-I/SO
Description
IC MCU FLASH 2KX14 EE 28SOIC
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16F688T-ISL.pdf
(688 pages)
3.PIC16C770-ISO.pdf
(8 pages)
4.PIC16F872-ISO.pdf
(168 pages)
5.PIC16F872-ISO.pdf
(5 pages)
6.PIC16F872-ISO.pdf
(6 pages)
7.PIC16F872-ISO.pdf
(168 pages)
Specifications of PIC16F872-I/SO
Program Memory Type
FLASH
Program Memory Size
3.5KB (2K x 14)
Package / Case
28-SOIC (7.5mm Width)
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
22
Eeprom Size
64 x 8
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 5.5 V
Data Converters
A/D 5x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Processor Series
PIC16F
Core
PIC
Data Bus Width
8 bit
Data Ram Size
128 B
Interface Type
I2C/SPI/SSP
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
22
Number Of Timers
3
Operating Supply Voltage
4 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
52715-96, 52716-328, 52717-734
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163022
Minimum Operating Temperature
- 40 C
On-chip Adc
5-ch x 10-bit
Package
28SOIC W
Device Core
PIC
Family Name
PIC16
Maximum Speed
20 MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
XLT28SO-1 - SOCKET TRANSITION 28SOIC 300MIL309-1073 - ADAPTER 28-SOIC TO 28-SOIC309-1024 - ADAPTER 28-SOIC TO 28-DIP309-1023 - ADAPTER 28-SOIC TO 28-DIP
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16F872-I/SO
Manufacturer:
MICROCHI
Quantity:
470
Company:
Part Number:
PIC16F872-I/SO
Manufacturer:
TI
Quantity:
5
Part Number:
PIC16F872-I/SO
Manufacturer:
MIC
Quantity:
20 000
4.0
The PIC16F872 provides three general purpose I/O
ports. Some pins for these 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 Reference Manual (DS33023).
4.1
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, the 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 PORTA 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 4-1:
© 2006 Microchip Technology Inc.
BCF
BCF
CLRF
BSF
MOVLW
MOVWF
MOVLW
MOVWF
Note:
I/O PORTS
PORTA and the TRISA Register
STATUS, RP0
STATUS, RP1
PORTA
STATUS, RP0
0x06
ADCON1
0xCF
TRISA
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
;
; Bank0
; Initialize PORTA by
; clearing output
; data latches
; Select Bank 1
; Configure all pins
; as digital inputs
; 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'.
FIGURE 4-1:
FIGURE 4-2:
Data
Bus
WR
Port
WR
TRIS
TRIS
To A/D Converter
RD
RD PORT
Note 1:
Note 1:
Data
Bus
WR
TRIS
WR
PORT
TRIS
RD
RD PORT
TMR0 clock input
TRIS Latch
Data Latch
D
D
CK
CK
I/O pins have protection diodes to V
I/O pin has protection diodes to V
TRIS Latch
Data Latch
D
D
CK
CK
Q
Q
Q
Q
Q
Q
Q
Q
BLOCK DIAGRAM OF
RA3:RA0 AND RA5 PINS
BLOCK DIAGRAM OF
RA4/T0CKI PIN
PIC16F872
Q
Q
EN
EN
Analog
Input
Mode
Schmitt
Trigger
Input
Buffer
EN
EN
D
D
DS30221C-page 29
V
N
V
SS
V
P
N
SS
DD
SS
DD
only.
and V
TTL
Input
Buffer
I/O pin
I/O pin
SS
.
(1)
(1)