General Lcd Status - Nintendo 1504166 - Game Boy Advance SP Edition Console Programming Manual

AGB Programming Manual

4.1.2 General LCD Status

General LCD status information can be read from bits 0-5 of the
DISPSTAT register.
In addition, 3 types of interrupt requests can be generated by the LCD
controller.
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Address Register
004h
DISPSTAT
DISPSTAT [d15-08] V Count Setting
Can be used to set the value used for V counter evaluation and V counter
match interrupts. The range for this setting is 0-227.
DISPSTAT [d05] V Counter Match Interrupt Request Enable Flag
Allows an interrupt request to be generated when the value of the V counter
setting and the value of the line actually rendered (VCOUNT register value)
agree.
DISPSTAT [d04] H-Blank Interrupt Request Enable Flag
Allows an interrupt request to be generated during horizontal blanking.
DISPSTAT [d03] V-Blank Interrupt Request Enable Flag
Allows an interrupt request to be generated during vertical blanking.
©1999 - 2001 Nintendo of America Inc.
V count setting
0-227
27
Attributes
R/W
V-Blank Status
0: Outside V-blank interval
1: During V-blank interval
H-Blank Status
0: Outside H-blank interval
1: During H-blank interval
V Counter Evaluation
0: V counter non-match
1: V counter match
V-Blank Interrupt Request Enable Flag
0: Disable
1: Enable
H-Blank Interrupt Request Enable Flag
0: Disable
1: Enable
V Counter Match Interrupt Request Enable Flag
0: Disable
1: Enable
D.C.N. AGB-06-0001-002B4
LCD
Initial Value
0000h