SH7262 datasheet(37/45 Pages) RENESAS

37 / 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 37 of 45

3.19

Sample Program Listing "serial_flash.c" (16/19)

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/* ---- 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.SPLW = 3;

/* Access width to the SPDR register: 32-bit */

RSPI0.SPCMD0.BIT.SPB = 3;

/* Transfer data length: 32-bit */

RSPI0.SPDCR.BIT.TXDMY = 1;

/* Enables to transmit the dummy data */

rd_sz >>= 2;

/* Calculates the number of transfers in longword */

while( rd_sz-- ){

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

/* wait */

}

*rd++ = RSPI0.SPDR.LONG;

}

RSPI0.SPDCR.BIT.TXDMY = 0;

/* Disables to transmit the dummy data */

io_wait_tx_end();

/* Waits for transfer end */

/* ==== Restores the SPI to default setting ==== */

RSPI0.SPCR.BIT.SPE = 0;

RSPI0.SPDCR.BIT.SPLW = 1;

/* Access width to the SPDR register: 8-bit */

RSPI0.SPCMD0.BIT.SPB = 7;

/* Transfer data length: 8-bit */

}

#ifdef SF_USE_DMAC

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