PIC16F871-E/L【PDF 77/143 页】IC MCU CMOS 20MHZ 2K FLSH 44PLCC

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录3887

73页 74页 75页 76页 [77页]78页 79页 80页 81页

2003 Microchip Technology Inc.

DS30569B-page 37

PIC16F870/871

4.3

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 4-5). 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

the destination should be avoided. The user should

refer to the corresponding peripheral section for the

correct TRIS bit settings.

FIGURE 4-5:

PORTC BLOCK DIAGRAM

(PERIPHERAL OUTPUT

OVERRIDE)

TABLE 4-5:

PORTC FUNCTIONS

TABLE 4-6:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTC

Port/Peripheral Select(2)

Data Bus

PORT

TRIS

Data Latch

TRIS Latch

RD TRIS

Schmitt

Trigger

Peripheral Data Out

VDD

Vss

PORT

Peripheral

OE(3)

Peripheral Input

I/O

pin(1)

Note 1:

I/O pins have diode protection to VDD and VSS.

2: Port/Peripheral Select signal selects between

port data and peripheral output.

3: Peripheral OE (Output Enable) is only activated

if Peripheral Select is active.

Name

Bit#

Buffer Type

Function

RC0/T1OSO/T1CKI

bit0

Input/output port pin or Timer1 oscillator output/Timer1 clock input.

RC1/T1OSI

bit1

Input/output port pin or Timer1 oscillator input.

RC2/CCP1

bit2

Input/output port pin or Capture1 input/Compare1 output/

PWM1 output.

RC3

bit3

Input/output port pin.

RC4

bit4

Input/output port pin.

RC5

bit5

Input/output port pin.

RC6/TX/CK

bit6

Input/output port pin or USART Asynchronous Transmit or

Synchronous Clock.

RC7/RX/DT

bit7

Input/output port pin or USART Asynchronous Receive or

Synchronous Data.

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

PORTC

RC7

RC6

RC5

RC4

RC3

RC2

RC1

RC0

xxxx xxxx

uuuu uuuu

87h

TRISC

PORTC Data Direction Register

1111 1111

Legend:

= unknown, u = unchanged

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式