32186 datasheet(586/1032 Pages) RENESAS

586 / 1032 page

SERIAL INTERFACE

12-38

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

Figure 12.4.1 Procedure for Initializing CSIO Reception

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.

• Set the register to CSIO mode

• Select the internal or external clock

Set SIO Transmit/Receive Mode Register

(When using the DMAC)

Set DMAC

(When using interrupts)

Set Interrupt Controller

• Select the source of receive interrupt request

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

Set SIO Receive Control Register

• Set the receive enable bit

End of CSIO receive initialization

• Enable or disable receive interrupt requests

Initialize CSIO reception

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

12.4 Receive Operation in CSIO Mode

32186 Datasheet(PDF) 586 Page - Renesas Technology Corp