Nintendo 1504166 - Game Boy Advance SP Edition Console Programming Manual page 130

AGB Programming Manual
Control Register
When Register RCNT (d15) = (0), the mode will be 8-bit normal serial communication
mode by setting to Register SIOCNT (d13, d12) = (0,0), and the mode will be 32-bit
normal serial communication mode by setting to SIOCNT (d13, d12) = (0, 1).
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Address Register
128h
SIOCNT
SIOCNT [d14] Interrupt Request Enable Flag
If 0 is set, an interrupt request will not be made.
If 1 is set, an interrupt request will be made immediately after transfer is
complete.
SIOCNT [d12] Transfer Length Setting Flag
Sets bit length of transfer data.
If 0, 8-bit transfer is carried out. If 1, 32-bit transfer is carried out.
SIOCNT [d07] Start Bit
With a setting of 1, a serial transfer starts. The bit is automatically reset
after transfer completion.
©1999 - 2001 Nintendo of America Inc.
0
Transfer Length Set Flag
0: 8-bit Transfer
1: 32-bit Transfer
Interrupt Request Enable Flag
0: Disable
1: Enable
130
Shift Clock Selection
0: Use external clock as
1: Use internal clock as
Internal Shift Clock Selection
0: 256 KHz
1: 2 MHz
Transfer enable flag receive
Transfer Enable Flag Send
0: Enable Transfer
1: Disable Transfer
Start Bit
0: No Serial Transfer
1: Start Serial Transfer
(reset when finished)
Communication Functions
Initial
Attributes
Value
R/W
0000h
receiver
sender
D.C.N. AGB-06-0001-002B4