I2CCON datasheet(60/210 Pages) MICROCHIP

60 / 210 page

dsPIC30F2011/2012/3012/3013

DS70139G-page 60

7.2

Configuring Analog Port Pins

The use of the ADPCFG and TRIS registers control the

operation of the A/D port pins. The port pins that are

desired

analog

inputs

must

have

their

corresponding TRIS bit set (input). If the TRIS bit is

cleared (output), the digital output level (VOH or VOL) is

converted.

When the PORT register is read, all pins configured as

analog input channels are read as cleared (a low level).

Pins configured as digital inputs will not convert an

analog input. Analog levels on any pin that is defined as

a digital input (including the ANx pins) may cause the

input buffer to consume the current that exceeds

device specifications.

7.2.1

I/O PORT WRITE/READ TIMING

One instruction cycle is required between a port

direction change or port write operation and a read

operation of the same port. Typically this instruction

would be a NOP.

EXAMPLE 7-1:

PORT WRITE/READ

EXAMPLE

MOV

#0xF0, W0

; Configure PORTB<7:4>

; as inputs

MOV

W0, TRISB

; and PORTB<3:0> as outputs

NOP

; additional instruction

cycle

btss PORTB, #7

; bit test RB7 and skip if

set

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