DSPIC30F2012 Microchip Technology Inc., DSPIC30F2012 Datasheet - Page 60

• Manufacturer Part Number: DSPIC30F2012
• Description: Dspic30f2011/2012/3012/3013 High-performance Digital Signal Controllers
• Manufacturer: Microchip Technology Inc.

dsPIC30F2011/2012/3012/3013
7.2
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 (V
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.
DS70139E-page 58
Configuring Analog Port Pins
OH
or V
OL
) is
7.2.1
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:
MOV #0xF0, W0; Configure PORTB<7:4>
MOV W0, TRISB; and PORTB<3:0> as outputs
NOP
btss PORTB, #7; bit test RB7 and skip if set
I/O PORT WRITE/READ TIMING
; as inputs
; additional instruction cycle
PORT WRITE/READ
EXAMPLE
© 2006 Microchip Technology Inc.