Nintendo 1504166 Programming Manual - Page 144
If Register SIOCNT d13,d12 = 1,1 is set when Register RCNT d15, you will go to UART communication
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AGB Programming Manual Communication Functions Control Register If Register SIOCNT (d13,d12) = (1,1) is set when Register RCNT (d15) = (0), you will go to UART communication mode. Address 128h Register 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Attributes SIOCNT 11 R/W Initial Value 0000h Baud Rate 00: 9600bps 01: 38400bps 10: 57600bps 11: 115200bps CTS Flag 0: Send always possible 1: Send possible during LOW input to SC terminal Parity Control 0: Even parity 1: Odd parity Send Data Flag 0: Not Full 1: Full Receive Data Flag 0: Not Empty 1: Empty Error Flag 0: No Error 1: Error Data Length 0: 7 bits 1: 8 bits FIFO Enable Flag 0: Disable 1: Enable Send Enable Flag 0: Disable 1: Enable Parity Enable Flag 0: Disable 1: Enable Receive Enable Flag 0: Disable 1: Enable Interrupt Request Enable Flag 0: Disable 1: Enable ©1999 - 2001 Nintendo of America Inc. 144 D.C.N. AGB-06-0001-002B4