PIC16F753 datasheet(47/230 Pages) MICROCHIP

47 / 230 page

 2013-2015 Microchip Technology Inc.

DS40001709C-page 47

PIC16F753/HV753

5.6

PORTC Registers

PORTC is a 6-bit wide port with five bidirectional and one

input-only pin. The corresponding data direction register

is TRISC (Register 5-2). Setting a TRISC bit (= 1) will

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

disable the output driver). Clearing a TRISC bit (= 0) will

make the corresponding PORTC pin an output (i.e.,

enables output driver and puts the contents of the output

latch on the selected pin). The exception is RA3, which

is input-only and its TRIS bit will always read as ‘1’.

Example 5-1 shows how to initialize PORTC.

Reading the PORTC register (Register 5-2) 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. RC3 reads ‘0’ when

MCLRE = 1.

The TRISC register controls the direction of the

PORTC pins, even when they are being used as

analog inputs. The user must 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’.

5.6.1

PORTC FUNCTIONS AND OUTPUT

PRIORITIES

Each PORTC pin is multiplexed with other functions. The

pins, their combined functions and their output priorities

are shown in Table 5-1.

When multiple outputs are enabled, the actual pin

control goes to the peripheral with the highest priority.

Analog input functions, such as comparator inputs, are

not shown in the priority lists. These inputs are active

when the peripheral is enabled and the input multiplexer

for the pin is selected. The Analog mode, set with the

ANSELC register, disables the digital input buffer

thereby preventing excessive input current when the

analog input voltage is between logic states. Digital

output functions may control the pin when it is in Analog

mode with the priority shown in Table 5-1.

Note:

The ANSEL register must be initialized to

configure an analog channel as a digital

input. Pins configured as analog inputs will

read ‘0’ and cannot generate an interrupt.

TABLE 5-3:

PORTC OUTPUT PRIORITY

Pin Name

Function Priority

RC0

OPA1IN+

C2IN0+

RC0

RC1

OPA1IN-

C1IN1-

C2IN1-

RC1

RC2

SLPCIN

OPA1OUT

C1IN2-

C2IN2-

RC2

RC3

C1IN3-

C2IN3-

RC3

RC4

COG1OUT1

C2OUT

RC4

RC5

COG1OUT0

CCP1

RC5

PIC16F753 数据表(PDF) 47 Page - Microchip Technology

PIC16F753 数据表(HTML) 47 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载