SH7262 datasheet(27/45 Pages) RENESAS

27 / 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 27 of 45

3.9

Sample Program Listing "serial_flash.c" (6/19)

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

* ID

* Outline

: Read data (byte transfer).

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

* Include

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

* Declaration

: void sf_byte_read(unsigned long addr, unsigned char *buf, int size);

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

* Description

: Reads the specified number of bytes from serial flash memory.

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

* Argument

: unsigned long addr ; I : Address in serial flash memory to read

: unsigned char *buf ; I : Buffer address to store the read data

: int size

; I : Number of bytes to read

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

* Return Value : void

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

* Note

: None

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

void sf_byte_read(unsigned long addr, unsigned char *buf, int size)

{

unsigned char cmd[5];

cmd[0] = SFLASHCMD_BYTE_READ;

cmd[1] = (unsigned char)((addr >> 16) & 0xff);

cmd[2] = (unsigned char)((addr >>

8) & 0xff);

cmd[3] = (unsigned char)( addr

& 0xff);

cmd[4] = 0x00;

io_cmd_exe_rdmode(cmd, 5, buf, size);

}

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

* ID

* Outline

: Read data (Longword transfer).

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

* Include

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

* Declaration

: void sf_byte_read_long(unsigned long addr, unsigned long *buf, int size);

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

* Description

: Reads the specified number of bytes in units of longword

: from serial flash memory.

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

* Argument

: unsigned long addr ; I : Address in serial flash memory to read

: unsigned long *buf ; I : Buffer address to store the read data

: int size

; I : Number of bytes to read

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

* Return Value : void

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

* Note

: None

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

SH7262 Datasheet(PDF) 27 Page - Renesas Technology Corp

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