SH7262 datasheet(30/45 Pages) RENESAS

30 / 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 30 of 45

3.12

Sample Program Listing "serial_flash.c" (9/19)

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/*""FUNC COMMENT""**************************************************************

* ID

* Outline

: Read status

*------------------------------------------------------------------------------

* Include

*------------------------------------------------------------------------------

* Declaration

: static unsigned char read_status(void);

*------------------------------------------------------------------------------

* Description

: Reads the status of serial flash memory.

*------------------------------------------------------------------------------

* Argument

: void

*------------------------------------------------------------------------------

* Return Value : Status register value

*------------------------------------------------------------------------------

* Note

: None

*""FUNC COMMENT END""**********************************************************/

static unsigned char read_status(void)

{

unsigned char buf;

unsigned char cmd[1];

cmd[0] = SFLASHCMD_READ_STATUS;

io_cmd_exe_rdmode(cmd, 1, &buf, 1);

return buf;

}

/*""FUNC COMMENT""**************************************************************

* ID

* Outline

: Write status

*------------------------------------------------------------------------------

* Include

*------------------------------------------------------------------------------

* Declaration

: static void write_status(unsigned char status);

*------------------------------------------------------------------------------

* Description

: Writes the status of serial flash memory.

*------------------------------------------------------------------------------

* Argument

: unsigned char status ; I : status register value

*------------------------------------------------------------------------------

* Return Value : void

*------------------------------------------------------------------------------

* Note

: None

*""FUNC COMMENT END""**********************************************************/

static void write_status(unsigned char status)

{

unsigned char cmd[2];

cmd[0] = SFLASHCMD_WRITE_STATUS;

cmd[1] = status;

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