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BG Screen Data Address Mapping for the LCD Screen, 1 Virtual Screen Size of 256 x 256 Dots

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AGB Programming Manual Rendering Functions 6.1.6 BG Screen Data Address Mapping for the LCD Screen 1) Text BG 1-1) Virtual Screen Size of 256 x 256 Dots 256 dots (32 blocks) 240 dots (30 blocks) 000H 002H 004H 006H 008H 040H 042H 044H 046H 048H 03AH 03CH 03EH 07AH 07CH 07EH 160 dots (20 blocks) 080H 082H 084H 086H 088H 0C0H 0C2H 0C4H 0C6H 0C8H 0BAH 0BCH 0BEH 0DAH 0DCH 0DEH 256 dots (32 blocks) 4C0H 4C2H 4C4H 4C6H 4C8H 4FAH 4FCH 4FEH 780H 782H 784H 786H 788H 7C0H 7C2H 7C4H 7C6H 7C8H LCD Display Area 7BAH 7BCH 7BEH 7FAH 7FCH 7FEH 1-2) Virtual Screen Size of 512 x 256 Dots 256 dots (32 blocks) 512 dots (64 blocks) 000 H 002 H 004 H 006 H 040 H 042 H 044 H 046 H 080 H 082 H 084 H 086 H 03A H 03C H 03E H 800 H 07A H 07C H 07E H 0BAH 0BC H 0BE H 256 dots (32 blocks) 4C0 H 4C2 H 4C4 H 4C6 H 4FA H 4FC H 4FE H 256 dots (32 blocks) 83E H 780 H 782 H 784 H 786 H 788 H 7C0 H 7C2 H 7C4 H 7C6 H 7C8 H 7BC H 7BE H 7FC H 7FE H FC0 H LCD Display Area FFE H ©1999 - 2001 Nintendo of America Inc. 45 D.C.N. AGB-06-0001-002B4

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

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AGB Programming Manual

Rendering Functions

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

6.1.6 BG Screen Data Address Mapping for the LCD Screen

1) Text BG

1-1) Virtual Screen Size of 256 x 256 Dots

LCD Display Area

000H

002H

004H

006H

040H

042H

044H

088H

080H

082H

084H

086H

008H

048H

03AH

046H

0C0H 0C2H 0C4H 0C6H

4C8H

4C0H 4C2H 4C4H 4C6H

0C8H

7C8H

7C0H 7C2H 7C4H 7C6H

07CH

03CH

0BCH

0DCH

4FCH

7FAH 7FCH

03EH

0BEH

07EH

0DEH

4FEH

7BEH

7FEH

07AH

0DAH

0BAH

4FAH

240 dots

(30 blocks)

160 dots

(20 blocks)

256 dots

(32 blocks)

256 dots

(32 blocks)

780H

782H

784H

788H

786H

7BAH 7BCH

1-2) Virtual Screen Size of 512 x 256 Dots

LCD Display Area

000

002

004

006

040

042

044

080

082

084

086

800

03A

046

83E

4C0

4C2

4C4

4C6

7C8

7C0

7C2

7C4

7C6

07C

03C

0BC

4FC

03E

0BE

07E

4FE

07A

0BA

4FA

256 dots

(32 blocks)

512 dots

(64 blocks)

256 dots

(32 blocks)

780

782

784

788

786

FFE

FC0

7FE

7FC

7BC

7BE

256 dots

(32 blocks)