PIC16LC926-SL 查看數據表（PDF） - Microchip Technology

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PIC16LC926-SL

64/68-Pin CMOS Microcontrollers with LCD Driver

Microchip Technology 

PIC16C925/926

4.3 PORTC and TRISC Register

PORTC is a 6-bit, bi-directional port. Each pin is individ-

ually configurable as an input or output through the

TRISC register. 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 destination should be avoided. The user

should refer to the corresponding peripheral section for

the correct TRIS bit settings.

EXAMPLE 4-3: INITIALIZING PORTC

BCF STATUS,RP0 ; Select Bank0

BCF STATUS,RP1

CLRF PORTC

; Initialize PORTC

BSF STATUS,RP0 ; Select Bank1

MOVLW 0xCF

; Value used to

; initialize data

; direction

MOVWF TRISC

; Set RC<3:0> as inputs

; RC<5:4> as outputs

; RC<7:6> always read 0

FIGURE 4-5:

RBPU(2)

Data Bus

WR Port

PORTC BLOCK DIAGRAM

(PERIPHERAL OUTPUT

OVERRIDE)

VDD

Data Latch

DQ

CK

P

Weak

Pull-up

I/O

pin(1)

WR TRIS

TRIS Latch

DQ

CK

TTL

Input

Buffer

RD TRIS

RD Port

QD

EN

RB0/INT

Schmitt Trigger

Buffer

RD Port

Note 1: I/O pins have diode protection to VDD and VSS.

2: To enable weak pull-ups, set the appropriate TRIS

bit(s) and clear the RBPU bit (OPTION<7>).

TABLE 4-5: PORTC FUNCTIONS

Name

RC0/T1OSO/T1CKI

RC1/T1OSI

RC2/CCP1

RC3/SCK/SCL

Bit# Buffer Type

bit0

ST

bit1

ST

bit2

ST

bit3

ST

RC4/SDI/SDA

bit4

ST

RC5/SDO

bit5

ST

Legend: ST = Schmitt Trigger input

Function

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

Input/output port pin or Timer1 oscillator input.

Input/output port pin or Capture input/Compare output/PWM output.

Input/output port pin or the synchronous serial clock for both SPI and

I2C modes.

Input/output port pin or the SPI Data In (SPI mode) or data I/O

(I2C mode).

Input/output port pin or Synchronous Serial Port data out.

TABLE 4-6: SUMMARY OF REGISTERS ASSOCIATED WITH PORTC

Address Name Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

Power-on

Reset

Value on all

other

RESETS

07h

PORTC

—

—

RC5 RC4 RC3 RC2 RC1 RC0 --xx xxxx

87h

TRISC

—

— PORTC Data Direction Control Register

--11 1111

Legend: x = unknown, u = unchanged, - = unimplemented, read as '0'. Shaded cells are not used by PORTC.

--uu uuuu

--11 1111

 2001 Microchip Technology Inc.

Preliminary

DS39544A-page 33

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