PIC18LC658T-ESLASHCL datasheet(108/366 Pages) MICROCHIP

108 / 366 page

PIC18CXX8

DS30475A-page 108

Advanced Information

 2000 Microchip Technology Inc.

8.10

PORTK, LATK, and TRISK Registers

PORTK is an 8-bit wide, bi-directional port available

only on the PIC18C858 devices. The corresponding

Data Direction register is TRISK. Setting a TRISK bit

(=1) will make the corresponding PORTK pin an input

(i.e., put the corresponding output driver in a

hi-impedance mode). Clearing a TRISK bit (=0) will

make the corresponding PORTK pin an output (i.e., put

the contents of the output latch on the selected pin).

Read-modify-write operations on the LATK register

read and write the latched output value for PORTK.

PORTK is an 8-bit port with Schmitt Trigger input buff-

ers. Each pin is individually configurable as an input or

output.

EXAMPLE 8-10: INITIALIZING PORTK

FIGURE 8-19: PORTK BLOCK DIAGRAM

TABLE 8-19:

PORTK FUNCTIONS

TABLE 8-20:

SUMMARY OF REGISTERS ASSOCIATED WITH PORTK

Note:

This port is available on PIC18C858.

CLRF

PORTK

; Initialize PORTK by

; clearing output

; data latches

CLRF

LATK

; Alternate method

; to clear output

; data latches

MOVLW

0xCF

; Value used to

; initialize data

; direction

MOVWF

TRISK

; Set RK3:RK0 as inputs

; RK5:RK4 as outputs

; RK7:RK6 as inputs

Data

Bus

WR LATK

WR TRISK

RD PORTK

Data Latch

TRIS Latch

RD TRISK

Schmitt

Trigger

Input

Buffer

I/O Pin

RD LATK

WR PORTK

Note:

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

Name

Bit#

Buffer Type

Function

RK0

bit0

Input/output port pin.

RK1

bit1

Input/output port pin.

RK2

bit2

Input/output port pin.

RK3

bit3

Input/output port pin.

RK4

bit4

Input/output port pin.

RK5

bit5

Input/output port pin.

RK6

bit6

Input/output port pin.

RK7

bit7

Input/output port pin.

Legend: ST = Schmitt Trigger input

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

TRISK

PORTK Data Direction Control Register

1111 1111

PORTK Read PORTK pin / Write PORTK Data Latch

xxxx xxxx

uuuu uuuu

LATK

Read PORTK Data Latch/Write PORTK Data Latch

xxxx xxxx

uuuu uuuu

Legend: x = unknown, u = unchanged

PIC18LC658T-E/CL Datasheet(PDF) 108 Page - Microchip Technology

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