DSPIC30F2010 datasheet(54/202 Pages) MICROCHIP

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dsPIC30F2010

DS70118J-page 54

8.2

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 as analog inputs must have their correspond-

ing TRIS bit set (input). If the TRIS bit is cleared (out-

put), the digital output level (VOH or VOL) will be

converted.

When reading the PORT register, all pins configured as

analog input channel will read as cleared (a low level).

Pins configured as digital inputs will not convert an ana-

log input. Analog levels on any pin that is defined as a

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

input buffer to consume current that exceeds the

device specifications.

8.2.1

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 8-1:

PORT WRITE/READ

EXAMPLE

8.3

Input Change Notification Module

The Input Change Notification module provides the

dsPIC30F devices the ability to generate interrupt

requests to the processor in response to a change-of-

state on selected input pins. This module is capable of

detecting input change-of-states even in Sleep mode,

when the clocks are disabled. There are up to 22 exter-

nal signals (CN0 through CN21) that may be selected

(enabled) for generating an interrupt request on a

change-of-state.

MOV 0xFF00, W0

; Configure PORTB<15:8>

; as inputs

MOV W0, TRISBB

; and PORTB<7:0> as outputs

NOP

; Delay 1 cycle

btss PORTB, #13 ; Next Instruction

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