Renesas Asynchronous SH7145F Uživatelský manuál stáhnout pdf (Strana 14)

SH7145F

Synchronous Serial Data Transmission

REJ06B0352-0100O/Rev.1.00 March 2004 Page 14 of 16

while(1); /* LOOP */

}

/**************************************************************

Function : init_sci

Operation : Initialize serial (sci0)

sci0 : Synchronous transmit operation

**************************************************************/

void init_sci(void)

{

unsigned long i;

P_STBY.MSTCR1.BIT.MSTP16 = 0; /* disable SCI0 standby mode */

/* Initialize SCI */

P_SCI0.SCR_0.BYTE &= 0x03; /* clear TIE,RIE,TE,RE,MPIE,TEIE */

P_SCI0.SCR_0.BIT.CKE = 0; /* clock:internal,SCK:output */

P_SCI0.SMR_0.BYTE = 0x80; /* Clock synchronous mode */

// CA = 1; /* Clock synchronous mode */

P_SCI0.BRR_0 = 24; /* 250kbps@25MHz(Peripheral) */

P_SCI0.SDCR_0.BIT.DIR = 0; /* LSB first send */

for( i=0; i < 0x0300 ; i++); /* Wait 1bit (over 4usec) */

/* Initialize SCI0 PORT */

P_PORTA.PACRL2.BIT.PA2MD = 1; /* set SCK0(PA2:132pin@SH7145) */

P_PORTA.PACRL2.BIT.PA1MD = 1; /* set TXD0(PA1:131pin@SH7145) */

P_PORTA.PAIORL.BIT.PA2IOR = 1; /* SCK0 Output */

P_SCI0.SCR_0.BIT.TE = 1; /* TE=1,Transmit Enable(SCI0) */

}

/************************************************************************/

/* Function : trans_sci */

/* Operation : Write 1 character to serial output */

/* Argument : c */

/* Value returned : None */

/************************************************************************/

void trans_sci(char c )

{

while(!(P_SCI0.SSR_0.BYTE & 0x80)); /* Wait until data can be written to TDR */

P_SCI0.TDR_0 = (unsigned char)c; /* Write data to TDR */

P_SCI0.SSR_0.BYTE &= 0x7F; /* Clear flag, transmit */

}

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Renesas Asynchronous SH7145F Uživatelský manuál Strana 14