VREF in PCH

[Orcino Borges]

Hi, in PCH with 18f458 the comand

setup_vref(OFF); not compiler and send a erro

"UNDEFINED INDENTIFER". I need VREF in a VDD.


Help me.

Thanks

Orcino
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This message was ported from CCS's old forum
Original Post ID: 12083

[R.J.Hamlett]

:=
:=
:= Hi, in PCH with 18f458 the comand
:=
:= setup_vref(OFF); not compiler and send a erro
:=
:= "UNDEFINED INDENTIFER". I need VREF in a VDD.
:=
:=
:= Help me.
The 18F458, does not have a internally configrable Vref (which this function is for). It allows you to connect the Vref input, to Vdd, AN3, or the internal _fixed_ reference voltage. This is done by the 'SETUP_ADC_PORTS' function. The 'SETUP_VREF' function, is confined to chips that have a configurable voltage divider internally attached to the Vref source, and this function then controls which 'tap' from the divider is used.
You need to look up which analog inputs you want to use, and then select the option with this combination, and Vref=Vdd. The options available are listed in the include file for the chip.

Best Wishes
___________________________
This message was ported from CCS's old forum
Original Post ID: 12084