Toshiba Stepper Driver support

Tosh stepper drivers need to be driven slower, so the stepper code
was interleaved to separate the pin HIGH from the pin LOW. This adds
enough instructions to make it work, without needing nops.

Marlin/Configuration_adv.h

@@ -219,9 +219,11 @@
 //#define QUICK_HOME  //if this is defined, if both x and y are to be homed, a diagonal move will be performed initially.
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}
-
+#ifdef CONFIG_STEPPERS_TOSHIBA
+#define MAX_STEP_FREQUENCY 10000 // Max step frequency for Toshiba Stepper Controllers
+#else
 #define MAX_STEP_FREQUENCY 40000 // Max step frequency for Ultimaker (5000 pps / half step)
-
+#endif
 //By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
 #define INVERT_X_STEP_PIN false
 #define INVERT_Y_STEP_PIN false