Nintendo 1504166 Programming Manual - Page 90

AGB Programming Manual

Sound

©1999 - 2001 Nintendo of America Inc.

90

D.C.N. AGB-06-0001-002B4

15

14

13

12

11

10

09

08

07

06

05

04

03

02

01

00

SOUND1

CNT_X

064h

0000h

R/W

Address

Register

Attributes

Initial

Value

NR13

NR14

Frequency Data

Sound Length Flag

0: Continuous

1: Counter

Initializaton Flag

SOUND1CNT_X [d15] Initialization Flag

A setting of 1 causes Sound 1 to restart.

When the sweep function is used, set the initialization flag again after an

interval of 8 clocks or more.

SOUND1CNT_X [d14] Sound Length Flag

When 0, sound is continuously output.

When 1, sound is output for only the length of time specified for the sound

length in NR11.

When sound output ends, the Sound 1 ON flag of NR52 is reset.

SOUND1CNT_X [d10 - 00] Frequency Data

With fdat signifying the frequency, the output frequency (f) is determined by

the following formula.

Hz

fdat

f

)

2048

(

2

4

4194304

3

-

×

×

=

Thus, the specifiable range of frequencies is 64 to 131.1 KHz.

[Sound 1 Usage Notes]

1.

When the sweep function is not used, the sweep time should be set to 0 and the

sweep increase/decrease flag should be set to 1.

2.

If sweep increase/decrease flag of NR10 is set to 0, the number of sweep shifts

set to a non-zero value, and sweep OFF mode is set, sound production may be

stopped.

3.

When a value is written to the envelope register, sound output becomes unstable

before the initialization flag is set.

Therefore, set initialization flag immediately

after writing a value to the envelope register.

4.

For sound 1, if you change the frequency when selecting a consecutive operation

mode (sound length flag of NR14 is 0), always set 0 for the data of sound length

(lower 6 bits of NR11) after setting the frequency data.

If 0 is not set, sound may

stop prematurely.

5.

If the Sound 1 initialization flag is set when the sweep function is used, always set

the initialization flag again after an interval of 8 clocks or more.

Unless the

initialization flag is set twice with an interval of 8 clocks or more, the sound may

not be heard

.

Section	Page
Introduction	3
Revision History	4
Table of Contents	9
Using This Manual	12
1 AGB System	13
1.1 System Overview	13
2 System Configuration	15
2.1 CPU Block Diagram	15
2.2 Complete Block Diagram	16
2.3 Memory Configuration and Access Width	17
2.4 Little-Endian	17
3 AGB Memory	18
3.1 Overall Memory Map	18
3.2 Memory Configuration	19
3.2.1 AGB Internal Memory	19
3.2.2 Game Pak Memory	20
3.3 Game Pak Memory Wait Control	21
3.3.1 Access Timing	23
3.3.2 Game Pak Bus	24
4 LCD	25
4.1 LCD Status	26
4.1.1 V Counter	26
4.1.2 General LCD Status	27
5 Image System	29
5.1 BG Modes	31
5.1.1 Details of BG Modes	31
5.1.2 VRAM Memory Map	32
6 Rendering Functions	33
6.1 Character Mode BG (BG Modes 0-2)	33
6.1.1 BG Control	33
6.1.2 Mosaic Size	39
6.1.3 VRAM Address Mapping of BG Data	40
6.1.4 Character Data Format	42
6.1.5 BG Screen Data Format	43
6.1.6 BG Screen Data Address Mapping for the LCD Screen	45
6.1.7 BG Rotation and Scaling Features	49
6.1.8 BG Scrolling	52
6.2 Bitmap Mode BGs (BG Modes 3-5)	53
6.2.1 BG Control	53
6.2.2 BG Rotation/Scaling	54
6.2.3 Pixel Data	54
6.2.4 Pixel Data Address Mapping for the LCD Screen	55
6.2.4.1 BG Mode 3 (32,768 colors,240x160 dots,1 frame buffer)	55
6.2.4.2 BG Mode 4 (256 colors,240x160 dots,2 frame buffers)	56
6.2.4.3 BG Mode 5 (32,768 colors,160x128 dots,2 frame buffers)	57
6.3 OBJ (Object)	58
6.3.1 OBJ Function Overview	58
6.3.2 Character Data Mapping	60
6.3.3 OAM	62
6.3.4 OBJ Rotation/Scaling Feature	70
6.4 Display Priority of OBJ and BG	72
7 Color Palettes	73
7.1 Color Palette Overview	73
7.2 Color Palette RAM	74
7.3 Color Data Format	76
8 Window Feature	77
8.1 Window Position Setting	77
8.2 Window Control	78
9 Color Special Effects	80
9.1 Selection of Color Special Effects	80
9.2 Color Special Effects Processing	82
10 Sound	84
10.1 Sound Block Diagram	84
10.2 Direct Sounds A and B	85
10.3 Sound 1	87
10.4 Sound 2	91
10.5 Sound 3	93
10.6 Sound 4	97
10.7 Sound Control	100
10.8 Sound PWM Control	104
11 Timer	106
12 DMA Transfer	108
12.1 DMA 0	109
12.2 DMA 1 and 2	113
12.3 DMA 3	117
12.4 DMA Problems: How to avoid them	122
13 Communication Functions	125
13.1 8-Bit/32-Bit Normal Serial Communication	128
13.2 16-Bit Multi-player Communication	134
13.3 UART Communication Functions	142
13.4 General Purpose Communication	148
13.5 JOY Bus Communication	150
13.6 AGB Game Link Cable	154
14 Key Input	155
14.1 Key Status	155
14.2 Key Interrupt Control	155
14.2.1 Interrupt Conditions	156
15 Interrupt Control	157
15.1 System-Allocated Area in Work RAM	159
15.2 Interrupt Operation	160
15.2.1 Normal Interrupt	160
15.2.2 Multiple Interrupts	161
16 Power-Down Functions	163
16.1 Stop Function	163
16.2 Halt Function	164
17 AGB System Calls	165
17.1 System Call Operation	165
17.1.1 Normal Calls	165
17.1.2 Multiple Calls	167

Nintendo 1504166 Programming Manual - Page 90

Sound 1 Usage Notes], SOUND1CNT_X [d10 - 00] Frequency Data

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