Motorola M68HC08 manual Software Variables and Defined Constants

Freescale Semiconductor, Inc.

Software Design

5.3.1 Software Variables and Defined Constants

Important system variables are listed in Table 5-1.

Table 5-1. Software Variables

	Name	Type	Representing Range	Description
	Sys1	Sys1_Def	8flags	System variable #1
	Speed_Min_U8	U8	< 0;	Minimal speed [system units]
			Speed_Range_Max_RPM)
	Sp_Input	U8	< 0; 255>	Speed input variable used for required
				speed calculation
Inc.
	Coef_Speed_Inp	U8		Coeficient Sp_Inp to Speed_Desired
				calculation
Semiconductor,	T_ZCros	U16	< 0;	Zero crossing time [n]
			[UNIT_PERIOD_T2_US]
	Speed_Desired	U8	Speed_Range_Max_RPM)	Desired speed
	PIParamsScl_U8_Spe	Structure		Speed PI regulator parameters
	ed
	Per_Speed_MAX_Ran			Minimal commutation period of the speed
	ge	U16	[UNIT_PERIOD_T2_US]	range
				(at Speed_Range_Max_RPM)
	Per_ZCrosFlt	U16	[UNIT_PERIOD_T2_US]	Zero crossing period — filtered
	T2	U16(union	[UNIT_PERIOD_T2_US]	Timer 2 variable
		)
Freescale
	Curr_Align	S8		Required current during alignment state
	T_ZCros0	U16(union	[UNIT_PERIOD_T2_US]	Zero crossing time [n-1]
		)
	T_Cmt	U16	[UNIT_PERIOD_T2_US]	Commutation time
	Curr	S8	<-Curr_Range_Max_cA;	dc-bus current
			Curr_Range_Max_cA)
			<-Curr_Range_Max_cA;
			Curr_Range_Max_cA)
	PIParamsScl_S8_Currr	Structure		Current PI regulator parameters
	Volt	U8	<-VOLT_RANGE_MAX;	dc-bus voltage
			VOLT_RANGE_MAX)
	V_TASC2	U8		Back-EMF zero crossing expecting edge
	V_MUX	U8		Preset value of back-EMF zero crossing
				phase multiplexer

Designer Reference Manual		DRM028 — Rev 0
76	Software Design	MOTOROLA
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