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Serial I/O
12.3 Transmit Operation in CSIO Mode
32180 Group User's Manual (Rev.1.0)
Figure 12.3.1 Procedure for Initializing CSIO Transmission
Set SIO Transmit/Receive Mode Register
Initialize CSIO transmission
Note 1: Necessary when the internal clock is selected.
Note 2: If the internal clock and a divide-by ratio = 1 are selected, caution must be used when setting the baud rate register
so that the transfer rate will not exceed 2 Mbps.
Note 3: Transmission finished interrupts are effective only when the internal clock is selected.
• Set the register to CSIO mode
• Select the internal or external clock
(When using the DMAC)
Set DMAC
(When using interrupts)
Set Interrupt Controller
Set SIO interrupt related registers
• Divide-by ratio = H'00 to H'FF (Note 2)
Set SIO Baud Rate Register
• Select the clock divider divide-by ratio (Note 1)
Set SIO Transmit Control Register
Set Input/Output Port
Operation Mode Register
Serial I/O
related registers
End of CSIO transmit initialization
• Enable or disable transmit interrupt requests
• Select the source of transmit interrupt request (Note 3)
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