Nintendo 1504166 - Game Boy Advance SP Edition Console Programming Manual page 145

AGB Programming Manual
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
Communication Functions
D.C.N. AGB-06-0001-002B4