PIC16F724-I/SP 查看數據表（PDF） - Microchip Technology

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PIC16F724-I/SP

28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology

Microchip Technology 

PIC16F72X/PIC16LF72X

6.4 PORTC and TRISC Registers

PORTC is a 8-bit wide, bidirectional port. The

corresponding data direction register is TRISC

(Register 6-11). Setting a TRISC bit (= 1) will make the

corresponding PORTC pin an input (i.e., put the

corresponding output driver in a High-Impedance mode).

Clearing a TRISC bit (= 0) will make the corresponding

PORTC pin an output (i.e., enable the output driver and

put the contents of the output latch on the selected pin).

Example 6-3 shows how to initialize PORTC.

Reading the PORTC register (Register 6-10) 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, this value is modified and then written

to the PORT data latch.

The TRISC register (Register 6-11) controls the PORTC

pin output drivers, even when they are being used as

analog inputs. The user should ensure the bits in the

TRISC register are maintained set when using them as

analog inputs. I/O pins configured as analog input always

read ‘0’.

EXAMPLE 6-3: INITIALIZING PORTC

BANKSEL PORTC

CLRF PORTC

BANKSEL TRISC

MOVLW B‘00001100’

MOVWF TRISC

;

;Init PORTC

;

;Set RC<3:2> as inputs

;and set RC<7:4,1:0>

;as outputs

The location of the CCP2 function is controlled by the

CCP2SEL bit in the APFCON register (refer to

Register 6-1)

REGISTER 6-10: PORTC: PORTC REGISTER

R/W-x

RC7

bit 7

R/W-x

RC6

R/W-x

RC5

R/W-x

RC4

R/W-x

RC3

R/W-x

RC2

R/W-x

RC1

R/W-x

RC0

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-0

RC<7:0>: PORTC General Purpose I/O Pin bits

1 = Port pin is > VIH

0 = Port pin is < VIL

REGISTER 6-11: TRISC: PORTC TRI-STATE REGISTER

R/W-1

TRISC7

bit 7

R/W-1

TRISC6

R/W-1

TRISC5

R/W-1

TRISC4

R/W-1

TRISC3

R/W-1

TRISC2

R/W-1

TRISC1

R/W-1

TRISC0

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-0

TRISC<7:0>: PORTC Tri-State Control bits

1 = PORTC pin configured as an input (tri-stated)

0 = PORTC pin configured as an output

© 2009 Microchip Technology Inc.

DS41341E-page 73

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