diff --git a/SD_CARD/BaS_gcc/sources/mmcbb.c b/SD_CARD/BaS_gcc/sources/mmcbb.c
index 8525325..e40787c 100644
--- a/SD_CARD/BaS_gcc/sources/mmcbb.c
+++ b/SD_CARD/BaS_gcc/sources/mmcbb.c
@@ -102,12 +102,7 @@
 
 
 static volatile DSTATUS Stat = STA_NOINIT;	/* Physical drive status */
-
-static volatile
-uint32_t Timer1, Timer2;	/* 1kHz decrement timer stopped at zero (disk_timerproc()) */
-
-static
-uint8_t CardType;			/* Card type flags */
+static uint8_t CardType;			/* Card type flags */
 
 
 
@@ -243,11 +238,9 @@ void power_off (void)		/* Disable SPI function */
 }
 
 
-
 /*-----------------------------------------------------------------------*/
 /* Receive a data packet from the MMC                                    */
 /*-----------------------------------------------------------------------*/
-
 static
 int rcvr_datablock (	/* 1:OK, 0:Error */
 	uint8_t *buff,			/* Data buffer */
@@ -255,13 +248,12 @@ int rcvr_datablock (	/* 1:OK, 0:Error */
 )
 {
 	uint8_t token;
+	uint32_t target = MCF_SLT_SCNT(0) - (200 * 1000L * 132);
 
-
-	Timer1 = 200;
 	do {							/* Wait for DataStart token in timeout of 200ms */
 		token = xchg_spi(0xFF);
 		/* This loop will take a time. Insert rot_rdq() here for multitask envilonment. */
-	} while ((token == 0xFF) && Timer1);
+	} while ((token == 0xFF) && MCF_SLT_SCNT(0) > target);
 	if(token != 0xFE) return 0;		/* Function fails if invalid DataStart token or timeout */
 
 	rcvr_spi_multi(buff, btr);		/* Store trailing data to the buffer */
@@ -374,12 +366,13 @@ DSTATUS disk_initialize(uint8_t drv)
 
 	ty = 0;
 	if (send_cmd(CMD0, 0) == 1) {			/* Put the card SPI/Idle state */
-		Timer1 = 1000;						/* Initialization timeout = 1 sec */
+		uint32_t target = MCF_SLT_SCNT(0) - (1000L * 1000L * 132);	/* 1 sec */
+
 		if (send_cmd(CMD8, 0x1AA) == 1) {	/* SDv2? */
 			for (n = 0; n < 4; n++) ocr[n] = xchg_spi(0xFF);	/* Get 32 bit return value of R7 resp */
 			if (ocr[2] == 0x01 && ocr[3] == 0xAA) {				/* Is the card supports vcc of 2.7-3.6V? */
-				while (Timer1 && send_cmd(ACMD41, 1UL << 30)) ;	/* Wait for end of initialization with ACMD41(HCS) */
-				if (Timer1 && send_cmd(CMD58, 0) == 0) {		/* Check CCS bit in the OCR */
+				while (MCF_SLT_SCNT(0) > target && send_cmd(ACMD41, 1UL << 30)) ;	/* Wait for end of initialization with ACMD41(HCS) */
+				if (MCF_SLT_SCNT(0) > target && send_cmd(CMD58, 0) == 0) {		/* Check CCS bit in the OCR */
 					for (n = 0; n < 4; n++) ocr[n] = xchg_spi(0xFF);
 					ty = (ocr[0] & 0x40) ? CT_SD2 | CT_BLOCK : CT_SD2;	/* Card id SDv2 */
 				}
@@ -390,8 +383,8 @@ DSTATUS disk_initialize(uint8_t drv)
 			} else {
 				ty = CT_MMC; cmd = CMD1;	/* MMCv3 (CMD1(0)) */
 			}
-			while (Timer1 && send_cmd(cmd, 0)) ;		/* Wait for end of initialization */
-			if (!Timer1 || send_cmd(CMD16, 512) != 0)	/* Set block length: 512 */
+			while (MCF_SLT_SCNT(0) > target && send_cmd(cmd, 0)) ;		/* Wait for end of initialization */
+			if (!MCF_SLT_SCNT(0) > target || send_cmd(CMD16, 512) != 0)	/* Set block length: 512 */
 				ty = 0;
 		}
 	}
@@ -641,15 +634,8 @@ DRESULT disk_ioctl (
 
 void disk_timerproc (void)
 {
-	uint16_t n;
 	uint8_t s;
 
-
-	n = Timer1;						/* 1kHz decrement timer stopped at 0 */
-	if (n) Timer1 = --n;
-	n = Timer2;
-	if (n) Timer2 = --n;
-
 	s = Stat;
 	if (WP)		/* Write protected */
 		s |= STA_PROTECT;