Renesas Asynchronous SH7145F - Manual (Page 15)

SH7145F
Asynchronous Serial Data Transmission/Reception
REJ06B0357-0100O/Rev.1.00 March 2004 Page 15 of 17
Function : init_sci
Operation : Initialize serial (sci1)
Asynchronous receive operation
-Data : 8bit
-Stop bit : 1bit
-Parity bit : No
**************************************************************/
void init_sci(void)
{
unsigned long i;
P_STBY.MSTCR1.BIT.MSTP17 = 0; /* disable SCI1 standby mode */
/* Initialize SCI Asynchronous mode * */
P_SCI1.SCR_1.BYTE &= 0x03 ; /* clear TIE,RIE,TE,RE,MPIE,TEIE */
P_SCI1.SCR_1.BIT.CKE = 0; /* clock:internal,SCK:output */
P_SCI1.SMR_1.BYTE = 0x00; /* 8bit,No parity,1stop bit */
// CA = 0; /* Asynchronous mode */
// CHR = 0; /* data length 8bits */
// PE = 0; /* No parity */
// OE = 0; /* (=0)even parity */
// STOP = 0; /* 1 stop bit */
// CKS = 0; /* clock source=P
φ
(25MHz) */
P_SCI1.BRR_1 = 40; /* 19200bps@25MHz(Peripheral) */
P_SCI1.SDCR_1.BIT.DIR = 0; /* LSB first send */
for( i=0; i < 0x0300 ; i++); /* Wait 1bit */
P_SCI1.SCR_1.BIT.TIE = 0; /* TXI1 interrupt disable */
P_SCI1.SCR_1.BIT.RIE = 0; /* RXI1,ERI interrupt disable */
/* Initialize SCI1 PORT */
P_PORTA.PACRL2.BIT.PA4MD = 1; /* set TXD1(PA4:134pin@SH7145) */
P_PORTA.PACRL2.BIT.PA3MD = 1; /* set RXD1(PA3:133pin@SH7145) */
P_SCI1.SCR_1.BYTE |= 0x30; /* TE=RE=1,Transmit and Receive Enable */
}
/******************************************************************************/
/* Function : rcv_sci */
/* Operation : Serial data receive and send function calls */
/* Argument : None */
/* Value returned : None */
/******************************************************************************/
unsigned char rcv_sci(unsigned char rev_count)
{
while(P_SCI1.SSR_1.BIT.RDRF == 0); /* Wait until reception finishes */
Rev_data[rev_count] = P_SCI1.RDR_1; /* get receive data */