PIC16F7X7 datasheet(67/276 Pages) MICROCHIP

67 / 276 page

 2004 Microchip Technology Inc.

DS30498C-page 65

PIC16F7X7

5.3

PORTC and the TRISC Register

PORTC is an 8-bit wide, bidirectional 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 high-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 5-5). 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

output, 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 and to Section 16.1 “Read-Modify-

Write Operations” for additional information on

read-modify-write operations.

FIGURE 5-16:

PORTC BLOCK DIAGRAM

(PERIPHERAL OUTPUT

OVERRIDE) RC<2:0>,

RC<7:5> PINS

FIGURE 5-17:

PORTC BLOCK DIAGRAM

(PERIPHERAL OUTPUT

OVERRIDE) RC<4:3> PINS

Port/Peripheral Select(2)

Data Bus

Port

TRIS

Data Latch

TRIS Latch

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.

TRIS

Port/Peripheral Select(2)

Data Bus

Port

TRIS

Data Latch

TRIS Latch

Schmitt

Trigger

Peripheral Data Out

VDD

Vss

Port

Peripheral

OE(3)

SSPl 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.

CKE

SSPSTAT<6>

Schmitt

Trigger

with

SMBus

Levels

TRIS

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