R8C/13 Group APPLICATION NOTE Flash Rewrite Using EW1 Mode

R8C/13 Group
Flash Rewrite Using EW1 Mode (Data "FFh" Search)
/************************************************************************************
Name: data_write
Parameters: Record data address
Returns: Program result
Description: Record program
************************************************************************************/
unsigned char data_write( unsigned char *write_data ){
unsigned char program_result = COMPLETE;
int i; /* loop counter */
/* If use interrupt then clear i flag... */
/* asm("fclr i "); */
/* flash control register set */
fmr0 = 0x01;
asm(""); /* Description for preventing the abbreviation by optimization */
fmr0 = 0x03; /* CPU rewrite enable */
fmr1 = 0x00;
asm(""); /* Description for preventing the abbreviation by optimization */
fmr1 = 0x02; /* EW1 mode */
for( i = 0; i < RECORD_SIZE; i++ ){
write_addr[i] = 0x40;
write_addr[i] = write_data[i];
while( fmr00 != 1 ); /* Ready check */
/* Program status check */
if( fmr06 == 1 ){
/* Program error */
*write_addr = 0x50; /* Clear stutus register */
program_result = PROGRAM_ERR;
break;
}
}
/* flash control register reset */
fmr0 = 0x01; /* CPU rewrite disable */
/* If use interrupt then set i flag... */
/* asm("fset i "); */
}
return program_result;
REJ05B0444-0110Z/Rev.1.10 August 2004 Page 22 of 25