32186 datasheet(579/1032 Pages) RENESAS

579 / 1032 page

SERIAL INTERFACE

12-31

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

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: Caution must be used when internal clock CSIO mode, the transfer rate does not exceed f(BCLK)/8.

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 interface

related registers

End of CSIO transmit initialization

• Enable or disable transmit interrupt requests

• Select the source of transmit interrupt request (Note 3)

Set SIO Special Mode Register

• Set the data length

• Select the clock divider count source

• Set the transfer order

• 3-point sampling control

• Select the clock polarity

12.3 Transmit Operation in CSIO Mode

32186 Datasheet(PDF) 579 Page - Renesas Technology Corp