PIC16F872-E/SO Microchip Technology, PIC16F872-E/SO Datasheet - Page 35

• Manufacturer Part Number: PIC16F872-E/SO
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,SOP,28PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F872-E/SO

• Rohs Compliant: YES
• 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
• Program Memory Size: 3.5KB (2K x 14)
• Program Memory Type: FLASH
• 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 ~ 125°C
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.3
PORTC is an 8-bit wide, bi-directional port. The corre-
sponding data direction register is TRISC. Setting a
TRISC bit (= ‘1’) will make the corresponding PORTC
pin an input (i.e., put the corresponding output driver in
a Hi-Impedance mode). Clearing a TRISC bit (= ‘0’) will
make the corresponding PORTC pin an output (i.e., put
the contents of the output latch on the selected pin).
PORTC is multiplexed with several peripheral functions
(Table 4-5). PORTC pins have Schmitt Trigger input
buffers.
When the I
can be configured with normal I
levels by using the CKE bit (SSPSTAT<6>).
When enabling peripheral functions, care should be
taken in defining TRIS bits for each PORTC pin. Some
peripherals override the TRIS bit to make a pin an out-
put, while other peripherals override the TRIS bit to
make a pin an input. Since the TRIS bit override is in
effect while the peripheral is enabled, read-modify-
write instructions (BSF, BCF, XORWF) with TRISC as
the destination should be avoided. The user should
refer to the corresponding peripheral section for the
correct TRIS bit settings.
FIGURE 4-5:
© 2006 Microchip Technology Inc.
Port/Peripheral Select
Peripheral Data Out
Data Bus
WR
PORT
WR
TRIS
RD
TRIS
Peripheral
OE
RD
PORT
Peripheral Input
Note 1:
(3)
2:
3:
PORTC and the TRISC Register
2
I/O pins have diode protection to V
Port/Peripheral select signal selects between port
data and peripheral output.
Peripheral OE (output enable) is only activated if
peripheral select is active.
C module is enabled, the PORTC (4:3) pins
TRIS Latch
Data Latch
D
D
CK
CK
Q
Q
Q
Q
(2)
PORTC BLOCK DIAGRAM
(PERIPHERAL OUTPUT
OVERRIDE) RC<2:0>
RC<7:5>
0
1
Q
2
C levels or with SMBus
EN
D
Schmitt
Trigger
DD
and V
V
V
N
P
SS
DD
SS
I/O pin
.
(1)
FIGURE 4-6:
Port/Peripheral Select
Peripheral Data Out
Data Bus
WR
PORT
WR
TRIS
RD
TRIS
Peripheral
OE
RD
PORT
SSPl Input
Note 1:
(3)
2:
3:
I/O pins have diode protection to V
Port/Peripheral select signal selects between port data
and peripheral output.
Peripheral OE (output enable) is only activated if
peripheral select is active.
Data Latch
TRIS Latch
D
D
CK
CK
(2)
Q
Q
Q
Q
PORTC BLOCK DIAGRAM
(PERIPHERAL OUTPUT
OVERRIDE) RC<4:3>
0
1
PIC16F872
Q
SSPSTAT<6>
CKE
EN
D
Schmitt
Trigger
DS30221C-page 33
DD
and V
Vss
0
1
V
P
N
DD
SS
Schmitt
Trigger
with
SMBus
Levels
.
pin
I/O
(1)