Nintendo 1504166 - Game Boy Advance SP Edition Console Programming Manual page 101

AGB Programming Manual
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Address Register
SOUND
084h
CNT_X
SOUNDCNT_X [d07] All Sounds Operation Flag
The master flag that controls whether sound functions as a whole are
operating.
A setting of 0 halts all sound functions including direct sound, producing a
mute state.
In this situation, the contents of all the Sound mode registers are reset.
Always set all the sound operation flags to 1 when setting each sound
mode register. You cannot set each sound mode register when all the
sound is stopped.
SOUNDCNT_X [d03, d02, d01, d00] Sound Operation Flags
Each sound circuit's status can be referenced.
Each sound is set during output, and when in counter mode it is reset after
the time passes which was set up with the length data.
©1999 - 2001 Nintendo of America Inc.
NR52
All Sounds Operation Flag
0: Halt
1: Operate
101
Sound
Initial
Attributes
Value
R/W
0000h
Sound 1 Operation Flag
0: Halt
1: Operate
Sound 2 Operation Flag
0: Halt
1: Operate
Sound 3 Operation Flag
0: Halt
1: Operate
Sound 4 Operation Flag
0: Halt
1: Operate
D.C.N. AGB-06-0001-002B4