PIC16C74/JW Microchip Technology, PIC16C74/JW Datasheet - Page 48

• Manufacturer Part Number: PIC16C74/JW
• Description: MICRO CTRL 4K 20MHZ EPROM 40CDIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C74/JW

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Size: 7KB (4K x 14)
• Program Memory Type: EPROM, UV
• Ram Size: 192 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Data Converters: A/D 8x8b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 40-CDIP (0.600", 15.24mm) Window
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

PIC16C7X
5.3
PORTC is an 8-bit bi-directional port. Each pin is indi-
vidually configurable as an input or output through the
TRISC register. PORTC is multiplexed with several
peripheral functions (Table 5-5). 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 5-3:
BCF
BCF
CLRF
BSF
MOVLW
MOVWF
TABLE 5-5:
DS30390E-page 48
Name
RC0/T1OSO/T1CKI
RC1/T1OSI/CCP2
RC2/CCP1
RC3/SCK/SCL
RC4/SDI/SDA
RC5/SDO
RC6/TX/CK
RC7/RX/DT
Legend: ST = Schmitt Trigger input
Note 1: The CCP2 multiplexed function is not enabled on the PIC16C72.
2: The TX/CK and RX/DT multiplexed functions are not enabled on the PIC16C72.
STATUS, RP0
STATUS, RP1
PORTC
STATUS, RP0
0xCF
TRISC
PORTC and TRISC Registers
Applicable Devices
72 73 73A 74 74A 76 77
(2)
(2)
PORTC FUNCTIONS
(1)
INITIALIZING PORTC
Bit#
; Select Bank 0
; PIC16C76/77 only
; 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
bit0
bit1
bit2
bit3
bit4
bit5
bit6
bit7
Buffer Type
ST
ST
ST
ST
ST
ST
ST
ST
Input/output port pin or Timer1 oscillator output/Timer1 clock input
Compare2 output/PWM2 output
output
RC3 can also be the synchronous serial clock for both SPI and I
modes.
RC4 can also be the SPI Data In (SPI mode) or data I/O (I
Synchronous Clock
Synchronous Data
Function
Input/output port pin or Timer1 oscillator input or Capture2 input/
Input/output port pin or Capture1 input/Compare1 output/PWM1
Input/output port pin or Synchronous Serial Port data output
Input/output port pin or USART Asynchronous Transmit, or USART
Input/output port pin or USART Asynchronous Receive, or USART
FIGURE 5-6:
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
TRIS Latch
Data Latch
D
D
RD TRIS
CK
CK
PORTC BLOCK DIAGRAM
(PERIPHERAL OUTPUT
OVERRIDE)
Q
Q
Q
Q
0
1
(2)
1997 Microchip Technology Inc.
Q
EN
D
Schmitt
Trigger
DD
2
V
C mode).
V
N
P
and V
SS
DD
2
I/O
pin
C
SS
(1)
.