Nintendo 1504166 - Game Boy Advance SP Edition Console Programming Manual page 28

AGB Programming Manual
DISPSTAT [d02] V Counter Evaluation
Flag indicating whether the V count setting and the V count register value
match. It is set while they match and automatically reset when they no
longer match.
DISPSTAT [d01] H-Blank Status
Can check whether a horizontal blanking interval is currently in effect.
DISPSTAT [d00] V-Blank Status
Can check whether a vertical blanking interval is currently in effect.
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D.C.N. AGB-06-0001-002B4