In SX Microcontrollers, SX/B Compiler and SX-Key Tool, kingneb wrote:

The nibble is read off PC a parallel port.  There are only 10 posible settings (speeds) for the PWM.  Zero means off and Ten means full speed.  The number 15 means activate a relay for the direction of the motor.  The number 14 means turn the relay off.  13 12 and 11 are used for nothing.  This is the code generated for a 100 cycle delay.  I am puzzled because I cannot see how to calculate the values that go into a loop like this.

d1	DS	1

			;98 cycles
	mov	w, #$19
	mov	d1, w
Delay_0:
	decsz	d1
	jmp	Delay_0

			;2 cycles
	nop
	nop

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