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Virtual Screen Size of 128 x 128 Dots, Rotation/scaling BG

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AGB Programming Manual 2) Rotation/scaling BG 2-1) Virtual Screen Size of 128 x 128 Dots 240 dots (30 blocks) 128 dots (16 blocks) 000H 001H 002H 003H 004H 010H 011H 012H 013H 014H 00FH 01FH 128 dots (16 blocks) 160 dots (20 blocks) 0E0H 0E1H 0E2H 0E3H 0E4H 0EFH 0F0H 0F1H 0F2H 0F3H 0F4H 0FFH LCD display area 2-2) Virtual Screen Size of 256 x 256 Dots 256 dots (32 blocks) 240 dots (30 blocks) 000H 001H 002H 003H 004H 01DH 01EH 01FH 020H 041H 042H 043H 044H 03DH 03EH 03FH 160 dots (20 blocks) 040H 081H 082H 083H 084H 060H 0C1H 0C2H 0C3H 0C4H 05DH 05EH 05FH 06DH 06EH 06FH 256 dots (32 blocks) 260H 261H 262H 263H 264H 280H 281H 282H 283H 284H 27DH 27EH 27FH 29DH 29EH 29FH 3C0H 3C1H 3C2H 3C3H 3C4H 3E0H 3E1H 3E2H 3E3H 3E4H LCD display area 3DDH 3DEH 3DFH 3FDH 3FE H 3FFH Rendering Functions ©1999 - 2001 Nintendo of America Inc. 47 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

2) Rotation/scaling BG

2-1) Virtual Screen Size of 128 x 128 Dots

LCD display area

000

001

002

003

010

011

012

004

014

00F

013

0E1

0E2

0E3

0F4

0E0

0F1

0F2

0F3

0E4

0F0

01F

0EF

0FF

128 dots

(16 blocks)

128 dots

(16 blocks)

240 dots

(30 blocks)

160 dots

(20 blocks)

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