PIC16C745SLASHP datasheet(35/158 Pages) MICROCHIP

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DS41124A-page 35

PIC16C745/765

5.3

PORTC and TRISC Registers

PORTC is a 5-bit bi-directional port. Each pin is individ-

ually configureable as an input or output through the

TRISC register. 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 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.

FIGURE 5-5:

PORTC BLOCK DIAGRAM

PORT/PERIPHERAL Select(1)

Data Bus

PORT

TRIS

Data Latch

TRIS Latch

RD TRIS

Schmitt

Trigger

Peripheral Data Out

VDD

VSS

PORT

Peripheral

OE(2)

Peripheral Input

I/O

Note 1: Port/Peripheral select signal selects between port

data and peripheral output.

2: Peripheral OE (output enable) is only activated if

peripheral select is active.

VDD

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