SH7262 datasheet(35/45 Pages) RENESAS

35 / 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 35 of 45

3.17

Sample Program Listing "serial_flash.c" (14/19)

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/* ---- Enables the SPI transfer ---- */

RSPI0.SPCR.BIT.SPE = 1;

/* ---- MOSI (command, address, dummy) ---- */

RSPI0.SPCMD0.BIT.CPOL= 1;

/* RSPCK when idling is 1 */

RSPI0.SPCMD0.BIT.CPHA= 0;

/* Outputs data on even (rising) edge */

while(ope_sz--){

RSPI0.SPDR.BYTE = *ope++;

/* Command size must be equal or less than 8 bytes */

}

io_wait_tx_end();

/* Waits for transfer end */

/* ---- MISO (read data) ---- */

RSPI0.SPCMD0.BIT.CPOL= 0;

/* RSPCK when idling is 0 */

RSPI0.SPCMD0.BIT.CPHA= 1;

/* Latches data on even (falling) edge */

RSPI0.SPBFCR.BYTE

= 0xC0u;

/* Resets buffer */

RSPI0.SPBFCR.BYTE

= 0x00u;

RSPI0.SPDCR.BIT.TXDMY = 1;

/* Enables to transmit the dummy data */

while(rd_sz--){

while( RSPI0.SPSR.BIT.SPRF == 0){

/* wait */

}

*rd++ = RSPI0.SPDR.BYTE;

}

RSPI0.SPDCR.BIT.TXDMY = 0;

/* Disables to transmit the dummy data */

io_wait_tx_end();

/* Waits for transfer end */

/* ---- SPI transfer end (SSL negation) ---- */

RSPI0.SPCR.BIT.SPE = 0;

}

SH7262 Datasheet(PDF) 35 Page - Renesas Technology Corp

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