DSPIC30F2011 datasheet(60/205 Pages) MICROCHIP

tên linh kiện	DSPIC30F2011

Giải thích chi tiết về linh kiện	High-Performance, 16-Bit Digital Signal Controllers

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60 / 205 page

dsPIC30F2011/2012/3012/3013

DS70139E-page 58

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 as analog inputs must have their correspond-

ing 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 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.

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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