SH7262 datasheet(18/45 Pages) RENESAS

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SH7262/SH7264 Group

High-speed Read/Write Serial Flash Memory

Using the Renesas Serial Peripheral Interface

REJ06B0889-0100/Rev.1.00

June 2009

Page 18 of 45

2.4.3

Main Function

The figure below shows the flow chart of the main function in the sample program. The sample program writes data in the

entire memory array, and compares the written value to the read value.

Main function

Verify OK?

Yes

• To access serial flash memory, initialize the RSPI as

described in 2.4.1 RSPI Initialization Example.

Initialize the RSPI

• Unprotect serial flash memory using the Write Status

Unprotect serial flash memory

Read one sector (64 KB) data from

serial flash memory

(note)

Display an error

Protect serial flash memory

• Execute the Read Array command (H'0B). As this command

reads the entire memory array continuously, the command

reads data in sectors in this application. Specify the access

width to the Data register (SPDR) in longword.

Write one page (256 bytes) data in

serial flash memory

• Execute the Byte/Page Program command (H'02). As the

Byte/Page program command cannot write data more than

the size of one page (256 bytes), continue to execute this

command to write in the entire memory array.

Writing in all

sectors

completed?

Yes

Compare the written data value with the

provided data

Erase the entire memory array

• Erase the entire memory array in serial flash memory using

the Chip Erase command (H'C7).

Generate one sector write data (64 KB)

Writing one sector

data completed?

Yes

Reading all sectors

completed?

Yes

Note: When using the DMA transfer, cache coherency must be maintained by software.

This sample program assigns the transfer destination buffer in cache-disabled space.

Figure 15 Main Function Flow Chart

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