PIC16C72-20I/SP Microchip Technology, PIC16C72-20I/SP Datasheet - Page 23

• Manufacturer Part Number: PIC16C72-20I/SP
• Description: IC MCU OTP 2KX14 A/D PWM 28DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C72-20I/SP

• 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: OTP
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Data Converters: A/D 5x8b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-DIP (0.300", 7.62mm)
• Processor Series: PIC16C
• 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: 1 x 16 bit
• Operating Supply Voltage: 2.5 V to 6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: ICE2000, DM163022
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 5 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

3.3
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 3-5). PORTC pins have Schmitt Trigger input
buffers.
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
destination should be avoided. The user should refer to
the corresponding peripheral section for the correct
TRIS bit settings.
EXAMPLE 3-1:
BCF
CLRF
BSF
MOVLW
MOVWF
1998 Microchip Technology Inc.
STATUS, RP0
PORTC
STATUS, RP0
0xCF
TRISC
PORTC and the TRISC Register
INITIALIZING PORTC
; Select Bank 0
; Initialize PORTC by
; clearing output
; data latches
; Select Bank 1
; Value used to
; initialize data
; direction
; Set RC<3:0> as inputs
; RC<5:4> as outputs
; RC<7:6> as inputs
Preliminary
FIGURE 3-5:
Peripheral Data Out
Data bus
Note 1: I/O pins have diode protection to V
PORT/PERIPHERAL Select
Peripheral input
Peripheral
OE
WR
TRIS
WR
PORT
(3)
2: Port/Peripheral select signal selects between port
3: Peripheral OE (output enable) is only activated if
data and peripheral output.
peripheral select is active.
RD
PORT
PIC16C72 Series
TRIS Latch
Data Latch
D
D
RD TRIS
CK
CK
PORTC BLOCK DIAGRAM
(PERIPHERAL OUTPUT
OVERRIDE)
Q
Q
Q
Q
0
1
(2)
Q
EN
D
DS39016A-page 23
Schmitt
Trigger
DD
V
V
N
P
and V
SS
DD
I/O
pin
SS
(1)
.