PIC18LF1320-I/PSQTP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18LF1320-I/PSQTP

18/20/28-Pin High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

Microchip Technology 

PIC18F1220/1320

FIGURE 10-6:

MCLR/VPP/RA5 PIN BLOCK DIAGRAM

MCLRE

Data Bus

RD TRISA

RD LATA

Schmitt

Trigger

Latch

QD

EN

MCLR/VPP/RA5

RD PORTA

High-Voltage Detect

Internal MCLR

Filter

HV

Low-Level

MCLR Detect

TABLE 10-1: PORTA FUNCTIONS

Name

Bit# Buffer

Function

RA0/AN0

bit 0

ST Input/output port pin or analog input.

RA1/AN1/LVDIN

bit 1

ST Input/output port pin, analog input or Low-Voltage Detect input.

RA2/AN2/VREF-

bit 2

ST Input/output port pin, analog input or VREF-.

RA3/AN3/VREF+

bit 3

ST Input/output port pin, analog input or VREF+.

RA4/T0CKI

bit 4

ST Input/output port pin or external clock input for Timer0.

Output is open-drain type.

MCLR/VPP/RA5

bit 5

ST Master Clear input or programming voltage input (if MCLR is enabled); input

only port pin or programming voltage input (if MCLR is disabled).

OSC2/CLKO/RA6 bit 6

ST OSC2, clock output or I/O pin.

OSC1/CLKI/RA7

bit 7

ST OSC1, clock input or I/O pin.

Legend: TTL = TTL input, ST = Schmitt Trigger input

TABLE 10-2: SUMMARY OF REGISTERS ASSOCIATED WITH PORTA

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

PORTA

LATA

TRISA

RA7(1) RA6(1)

LATA7(1) LATA6(1)

TRISA7(1) TRISA6(1)

RA5(2)

—

—

RA4 RA3 RA2 RA1

LATA Data Output Register

PORTA Data Direction Register

RA0 xx0x 0000 uu0u 0000

xx-x xxxx uu-u uuuu

11-1 1111 11-1 1111

ADCON1 —

PCFG6 PCFG5 PCFG4 PCFG3 PCFG2 PCFG1 PCFG0 -000 0000 -000 0000

Legend: x = unknown, u = unchanged, – = unimplemented locations read as ‘0’. Shaded cells are not used by PORTA.

Note 1: RA7:RA6 and their associated latch and data direction bits are enabled as I/O pins based on oscillator

configuration; otherwise, they are read as ‘0’.

2: RA5 is an input only if MCLR is disabled.

© 2007 Microchip Technology Inc.

DS39605F-page 89

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