PIC16C925-SSLASHCL datasheet(35/182 Pages) MICROCHIP

35 / 182 page

 2001 Microchip Technology Inc.

Preliminary

DS39544A-page 33

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

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

FIGURE 4-5:

PORTC BLOCK DIAGRAM

(PERIPHERAL OUTPUT

OVERRIDE)

TABLE 4-5:

PORTC FUNCTIONS

TABLE 4-6:

SUMMARY OF REGISTERS ASSOCIATED WITH 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

Data Latch

RBPU(2)

VDD

Data Bus

WR Port

WR TRIS

RD TRIS

RD Port

Weak

Pull-up

RD Port

RB0/INT

I/O

pin(1)

TTL

Input

Buffer

Schmitt Trigger

Buffer

TRIS Latch

Note 1:

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

To enable weak pull-ups, set the appropriate TRIS

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

Name

Bit#

Buffer Type

Function

RC0/T1OSO/T1CKI

bit0

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

RC1/T1OSI

bit1

Input/output port pin or Timer1 oscillator input.

RC2/CCP1

bit2

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

RC3/SCK/SCL

bit3

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

I2C modes.

RC4/SDI/SDA

bit4

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

(I2C mode).

RC5/SDO

bit5

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

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

Power-on

Reset

Value on all

other

RESETS

07h

PORTC

—

RC5

RC4

RC3

RC2

RC1

RC0

--xx xxxx

--uu uuuu

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.

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