SH7262 datasheet(29/45 Pages) RENESAS

29 / 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 29 of 45

3.11

Sample Program Listing "serial_flash.c" (8/19)

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

* ID

* Outline

: Write disable

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

* Include

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

* Declaration

: static void write_disable(void);

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

* Description

: Issues the Write Disable command to disable erasing or programming

: serial flash memory.

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

* Argument

: void

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

* Return Value : void

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

* Note

: None

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

static void write_disable(void)

{

unsigned char cmd[1];

cmd[0] = SFLASHCMD_WRITE_DISABLE;

io_cmd_exe(cmd, 1, NULL, 0);

}

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

* ID

* Outline

: Busy wait

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

* Include

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

* Declaration

: static void busy_wait(void);

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

* Description

: Loops internally when the serial flash memory is busy.

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

* Argument

: void

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

* Return Value : void

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

* Note

: None

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

static void busy_wait(void)

{

while ((read_status() & 0x01) != 0) {

/* RDY/BSY */

/* serial flash is busy */

}

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