SH7262 datasheet(16/45 Pages) RENESAS

16 / 45 page

SH7262/SH7264 Group

High-speed Read/Write Serial Flash Memory

Using the Renesas Serial Peripheral Interface

REJ06B0889-0100/Rev.1.00

June 2009

Page 16 of 45

End

DMA transfer is

completed?

Yes

Disable the SPI to transfer data

• Set the SPCR register (SPE bit = 0)

Function: Disable the RSPI

SSL signal is negated by this setting. As the RSPI control bit is

not initialized, reset the SPE bit to 1 to activate the RSPI in the

same transfer mode.

• Make sure the transfer is complete before clearing the SPE bit.

Wait for the transfer end

Start to transmit dummy data

• Set the SPDCR register (TXDMY bit = 1)

Function: Enable the SPI to transmit dummy data (The dummy data is

automatically sent when not writing data in the Data register.)

Stop transmitting the dummy data

Reset the access width in bytes

• Set the SPDCR register (SPLW bit = 1)

Function: Specify the access width to the SPDR register as 8-bit

• Set the SPCMD register (SPB bit = 7)

Function: Specify the transfer data length as 8-bit

Disable the DMA transfer

Figure 13 Flow Chart of the Read Command Transfer (3/3)

SH7262 Datasheet(PDF) 16 Page - Renesas Technology Corp