參數(shù)資料
型號： PIC16F77
廠商： Microchip Technology Inc.
英文描述： 40-Pin 8-Bit CMOS FLASH Microcontrollers(40腳、8位CMOS 閃速微控制器)
中文描述： 40引腳8位CMOS閃存微控制器（40腳，8位的CMOS閃速微控制器）
文件頁數(shù)： 33/170頁
文件大?。?/td> 3150K
代理商： PIC16F77
2000 Microchip Technology Inc.
Advance Information
DS30325A-page 33
PIC16F7X
3.3
PORTC and the TRISC Register
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.
FIGURE 3-5:
PORTC BLOCK DIAGRAM
(PERIPHERAL OUTPUT
OVERRIDE)
TABLE 3-5:
PORTC FUNCTIONS
TABLE 3-6:
SUMMARY OF REGISTERS ASSOCIATED WITH PORTC
Port/Peripheral Select
(2)
Data Bus
WR
Port
WR
TRIS
RD
Port
Data Latch
TRIS Latch
RD TRIS
Schmitt
Trigger
Q
D
Q
CK
Q
D
EN
Peripheral Data Out
0
1
Q
D
Q
CK
P
N
V
DD
V
SS
Peripheral
OE
(3)
Peripheral Input
Note 1:
I/O pins have diode protection to V
DD
and V
SS
.
Port/Peripheral select signal selects between port data
and peripheral output.
Peripheral OE (output enable) is only activated if
peripheral select is active.
2:
3:
I/O
pin
(1)
Name
Bit#
Buffer Type
Function
RC0/T1OSO/T1CKI
RC1/T1OSI/CCP2
bit0
bit1
ST
ST
Input/output port pin or Timer1 oscillator output/Timer1 clock input.
Input/output port pin or Timer1 oscillator input or Capture2 input/
Compare2 output/PWM2 output.
Input/output port pin or Capture1 input/Compare1 output/PWM1 output.
RC3 can also be the synchronous serial clock for both SPI and I
2
C
modes.
RC4 can also be the SPI Data In (SPI mode) or Data I/O (I
2
C mode).
Input/output port pin or Synchronous Serial Port data output.
Input/output port pin or USART Asynchronous Transmit or
Synchronous Clock.
Input/output port pin or USART Asynchronous Receive or
Synchronous Data.
RC2/CCP1
RC3/SCK/SCL
bit2
bit3
ST
ST
RC4/SDI/SDA
RC5/SDO
RC6/TX/CK
bit4
bit5
bit6
ST
ST
ST
RC7/RX/DT
bit7
ST
Legend: ST = Schmitt Trigger input
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on:
POR,
BOR
Value on
all other
RESETS
07h
87h
Legend:
x
= unknown,
u
= unchanged
PORTC
TRISC
RC7
PORTC Data Direction Register
RC6
RC5
RC4
RC3
RC2
RC1
RC0
xxxx xxxx
uuuu uuuu
1111 1111
1111 1111
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