Nintendo 1504166 - Game Boy Advance SP Edition Console Programming Manual page 94

AGB Programming Manual
Address Register 15
SOUND3
072h
CNT_H
SOUND3CNT_H [d15] Forced 3/4 Output Level Specification Flag
With 0 specified, the output level specified in NR32 [d14-13] is used.
A setting of 1 forces a 3/4 output level regardless of the setting in NR32
[d14-13].
SOUND3CNT_H [d14 - 13] Output Level Selection
The Sound 3 output-level selections are as shown in the following table.
Setting
00
01
10
11
SOUND3CNT_H [d07 - 00] Sound Length
The sound length, time, is determined by the following formula, with st signifying
the sound-length setting.
Address Register 15
SOUND3
074h
CNT_X
SOUND3CNT_X [d15] Initialization Flag
When SOUND3CNT_L [d07] is 1, a setting of 1 in this bit causes Sound 3
to restart.
©1999 - 2001 Nintendo of America Inc.
14 13 12 11 10 09 08
NR32
Output Level Selection
Forced 3/4 Output Level Spec. Flag
Mute
Outputs the waveform RAM data unmodified.
Outputs the waveform RAM data with the contents right-shifted
1 bit (1/2).
Outputs the waveform RAM data with the contents right-shifted
2 bits (1/4).
time ( 256
14 13 12 11 10 09 08
NR34
Sound Length Flag
0: Continuous
1: Counter
Initializaton Flag
07 06 05 04 03 02
NR31
Sound Length
0-255
Output Level
1
st ) (sec)
256
07 06 05 04 03 02
NR33
Frequency Data
94
Initial
01 00 Attributes
Value
R/W 0000h
Initial
01 00 Attributes
Value
R/W 0000h
D.C.N. AGB-06-0001-002B4
Sound