Nintendo 1504166 - Game Boy Advance SP Edition Console Programming Manual page 129

AGB Programming Manual
8 bit Normal Serial Communication Data Register
8-bit transfer mode uses SIODATA8 as a data register. The upper 8-bits will become
disabled.
(This data register is used for 16 bit multi-play communication as well.)
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Address Register
12Ah
SIODATA8
32-bit Normal Serial Communication Data Register
32-bit transfer mode uses [120h:SIODATA32_L] and [122h:SIODATA32_H] as data
registers.(These data registers are used for 16-bit multi-player communication also.)
The most significant bit will be d15 in the register SIODATA32_H, and the least
significant bit will be d0 in the register SIODATA32_L.
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Address Register
SIODATA
120h
32_L
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Address Register
SIODATA
122h
32_H
©1999 - 2001 Nintendo of America Inc.
Data 0
Data 1
129
Communication Functions
Initial
Attributes
Value
R/W
0000h
Initial
Attributes
Value
R/W 0000h
Initial
Attributes
Value
R/W 0000h
D.C.N. AGB-06-0001-002B4