diff --git a/system/libarc32_arduino101/drivers/spi_priv.h b/system/libarc32_arduino101/drivers/spi_priv.h
index d46127d9..4c9bdab9 100644
--- a/system/libarc32_arduino101/drivers/spi_priv.h
+++ b/system/libarc32_arduino101/drivers/spi_priv.h
@@ -60,8 +60,9 @@
 #define     SPI_NDF_SET_MASK    (0x0000ffff)
 #define     SPI_SRL_SET_MASK    (0xfffff7ff)
 #define     SPI_TMOD_SET_MASK   (0xfffffcff)
-#define     SPI_SCPL_SET_MASK   (0xffffff7f)
-#define     SPI_SCPH_SET_MASK   (0xffffffbf)
+#define     SPI_SCPL_SET_MASK   (0x80)
+#define     SPI_SCPH_SET_MASK   (0x40)
+#define     SPI_FRF_SET_MASK    (0x30)
 #define     SPI_DFS_SET_MASK    (0xfffffff0)
 
 #define     SPI_CLK_ENABLED     (1 << 15)
diff --git a/system/libarc32_arduino101/drivers/ss_spi.c b/system/libarc32_arduino101/drivers/ss_spi.c
index 20689aba..1c945948 100644
--- a/system/libarc32_arduino101/drivers/ss_spi.c
+++ b/system/libarc32_arduino101/drivers/ss_spi.c
@@ -103,8 +103,8 @@ void ss_spi_set_data_mode(SPI_CONTROLLER controller_id, uint8_t dataMode)
 
     /* Set frame size, bus mode and transfer mode */
     ctrl = READ_ARC_REG(dev->reg_base + CTRL);
-    ctrl &= (SPI_SCPL_SET_MASK & SPI_SCPH_SET_MASK);
-    ctrl = (dataMode << 6);
+    ctrl |= (SPI_SCPL_SET_MASK | SPI_SCPH_SET_MASK);
+    ctrl |= (dataMode << 4) & ~SPI_FRF_SET_MASK;
     WRITE_ARC_REG(ctrl, dev->reg_base + CTRL);
 
     /* re-enable controller */
diff --git a/variants/arduino_101/libarc32drv_arduino101.a b/variants/arduino_101/libarc32drv_arduino101.a
index e0cb6b8e..fe76d732 100644
Binary files a/variants/arduino_101/libarc32drv_arduino101.a and b/variants/arduino_101/libarc32drv_arduino101.a differ