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NCR NCR 5972 Home Theater Screen User Manual

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4-4 Chapter 4: Programming Set Up

Reset Display

Format: 1B01

Returns: xxyyzz

• wherexxistheMicrocontrollerstatus:

− 00 = OK

Ifafailureoccurs,testinghalts,andthefirmwarebegins

executingaloopasdescribedintheInternalPowerUP

DiagnosticssectionintheInstallationchapter.

• whereyyistheExternalCharacterPROMstatus:

− 00 = Not present (Always 00 for LCD)

− 01 = OK, present

− FF = Failure

• wherezzisthenumber(inhex)ofcharactersetsavailableinthe

ExternalCharacterPROM

− 00 = 10 (Always 00 for LCD)

Description: Thiscommandexecutesthepower‐downpower‐up

diagnosticsequence.Thecommunicationlines(CTSforserial,

BUSYforparallel)areplacedinanexceptioncondition(seethe



InternalPowerUPDiagnosticssectionintheInstallationchapter).The

Microcontrollertestconsistsofacheck‐sumtestontheROManda

write/readtestontheRAM.Acheck‐sumtestisalsoperformedon

theExternalCharacterPROMthatholdsanyuser‐defined

characterssets(Thisdoesnot

applytotheLCD).

Afterexecutingthecommand,thethreestatusbytes(seeabove)are

senttothehost,thedisplayscreeniscleared,thecursormovesto

the0position,communicationlineexceptionco nditions are

cleared,andallregistersandvariablesareinitialized.Notethatthe

screenisclearedduring

thiscommand.Ifahostneedsprevious

dataredisplayed,thehostmustresendthepreviousdataafterthis

commandhascompleted.

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