Nintendo 1504166 - Game Boy Advance SP Edition Console Programming Manual

Contents

Nintendo 1504166 - Game Boy Advance SP Edition Console Programming Manual Manual pdf 27 page image

AGB Programming Manual LCD©1999 - 2001 Nintendo of America Inc. 27 D.C.N. AGB-06-0001-002B44.1.2 General LCD StatusGeneral LCD status information can be read from bits 0-5 of theDISPSTAT register.In addition, 3 types of interrupt requests can be generated by the LCDcontroller.15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00DISPSTAT004h 0000hR/WAddress Register Initial ValueV count setting0-227V-Blank Status0: Outside V-blank interval1: During V-blank intervalH-Blank Status0: Outside H-blank interval1: During H-blank intervalV Counter Evaluation0: V counter non-match1: V counter matchV-Blank Interrupt Request Enable Flag0: Disable1: EnableH-Blank Interrupt Request Enable Flag0: Disable1: EnableV Counter Match Interrupt Request Enable Flag0: Disable1: EnableAttributesDISPSTAT [d15-08] V Count SettingCan be used to set the value used for V counter evaluation and V countermatch interrupts. The range for this setting is 0-227.DISPSTAT [d05] V Counter Match Interrupt Request Enable FlagAllows an interrupt request to be generated when the value of the V countersetting and the value of the line actually rendered (VCOUNT register value)agree.DISPSTAT [d04] H-Blank Interrupt Request Enable FlagAllows an interrupt request to be generated during horizontal blanking.DISPSTAT [d03] V-Blank Interrupt Request Enable FlagAllows an interrupt request to be generated during vertical blanking.