Nintendo 1504166 Programming Manual - Page 145
SIOCNT [d14] Interrupt Request Enable Flag, SIOCNT [d11] Receive Enable Flag
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AGB Programming Manual Communication Functions SIOCNT [d14] Interrupt Request Enable Flag When set to 0, an interrupt request is not generated. When set to 1 and FIFO is invalid, an interrupt request is generated when a communication error occurs or when the transmission(send/receive) ends. When set to 1 and FIFO is valid, an interrupt request is generated when a communication error occurs, when a send FIFO is emptied, or a receive FIFO becomes full. SIOCNT [d11] Receive Enable Flag Controls the receive enable/disable. If the receive enable flag is set when the receive data register (or the receive FIFO) is not full, a LO is output from the SD terminal, and a HI is output if it is reset. You must first set the receive enable flag and send enable flag to 0 [Disable] before going from UART communication mode to a different communication mode. SIOCNT [d10] Send Enable Flag Controls the send enable/disable. You must first set the receive enable flag and send enable flag to 0 [Disable] before going from UART communication mode to a different communication mode. SIOCNT [d09] Parity Enable Flag Controls the parity enable/disable. SIOCNT [d08] FIFO Enable Flag Controls the send of the 8 bit wide × 4 depth and the receive FIFO enable/disable. When using FIFO, first you need to go into UART mode in a status of 0 [FIFO Disable]. By disabling FIFO in UART mode the FIFO sequencer is initialized. SIOCNT [d07] Data Length Select data length as 8 bits or 7 bits. ©1999 - 2001 Nintendo of America Inc. 145 D.C.N. AGB-06-0001-002B4