Home » Nintendo Manuals » Video Game Consoles » Nintendo 1504166 » Manual Viewer

Nintendo 1504166 Programming Manual - Page 148

General Purpose Communication, RCNT[d07 - d04] Input/Output Selection Flag

Add to My Manuals
Save this manual to your list of manuals

Page 148 highlights

AGB Programming Manual Communication Functions 13.4 General Purpose Communication By setting (d15, d14 )= (1, 0) for RCNT register, it will change to a general purpose communication mode. In this mode, all of the terminals SI, SO, SC, and SD become pull-up and operate as general purpose input/output terminals. Each of the communication terminals SI, SO, SC, and SD can be directly controlled. Address Register 134h RCNT 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Attributes SO SI SD SC SO SI SD SC R/W Initial Value 0000h Data Bit Communication Function Set Flag 0*: Serial Communication 10: General Purpose Input/Output Terminal 11: JOY Bus Communication Input/Output Selection Flag 0: Set to Input 1: Set to Output Interrupt Request Enable Flag 0: Disable 1: Enable RCNT [d15 - d14] Communication Function Set Flag When set to 00 or 01, operates as a serial communication(8-bit/16-bit serial communication, multi-player communication, UART communication function) terminal. When set to 10, can be used as a general purpose input/output terminal. When set to 11, can be used as a JOY Bus communication terminal. RCNT [d08] Interrupt Request Enable Flag When general purpose input/output is set(R[d15,d14]=[1,0]) with the communication function set flag, a 1 causes an interrupt request to be generated with the falling of the SI Terminal(edge detect). When set to 0, no interrupt request is generated. RCNT[d07 - d04] Input/Output Selection Flag When general purpose input/output is set (R[d15,d14]=[1,0]) with the communication function set flag, a setting of 0 allows the corresponding terminal to be used as an input terminal. A setting of 1 allows the corresponding terminal to be used as an output terminal. [Caution] Always set the SI terminal to an input. If it is set to an output, a problem may occur with some connecting equipment. ©1999 - 2001 Nintendo of America Inc. 148 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