Freescale Semiconductor M68HC08 manual defines the minimum HRP frequency in kHz

Software Design
22.	#define	MIN_IGNITION_FREQ			45
	...defines the minimum HRP frequency in kHz.
23.	#define	MAX2PREHEAT_RAMP			100
	...represents the number of frequency steps between the maximum HRP frequency and the
	preheat HRP frequency.			2000
24.	#define	IGNITION_RAMP
	...represents the number of frequency steps between preheat HRP frequency and ignition HRP
	frequency.	MIN_RUN_HRP_FREQ			50	/*see DLB_setup.xls */
25.	#define
	...defines the minimum HRP frequency in kHz during run mode.
26.	#define	MAX_RUN_HRP_FREQ			100	/*see DLB_setup.xls */
	...defines the maximum HRP frequency in kHz during run mode.
27.	#define	TUBE_CURR_MIN		10	/*see DLB_setup.xls */
	...represents the minimum tube current.					/*see DLB_setup.xls */
28.	#define	TUBE_CURR_MAX		245
	...represents the maximum tube current.
29.	#define	CURRFLT_MS	100
	...sets the zero current checking interval in ms.
30.	#define	CURRFLT_CNT	3
	...represents the number of fault states during run mode.
31.	#define	INGITION_CNT		3
	...represents the number of fault states during tube ignition.
32.	#define	ADDMINITERVAL		100
	...represents the interval of dimming value measurement in ms.
33.	#define	UC_REQUIRED_AN		390L
	...represents the required DC-bus voltage in V.
34.	#define	UC_ALLOWED_MIN_AN			290L
	...represents the minimum allowed DC-bus voltage in V.
35.	#define	UC_ALLOWED_MAX_AN			450L
	...defines the maximum allowed DC-bus voltage in V.
36.	#define	UC_MAX_VAL_AN		458L
	...represents the maximum value of the DC-bus voltage in V.
37.	#define	UC_START_PREHEAT_AN				370L
	...represents the preheat DC-bus voltage in V.
38.	#define	UC_START_CYCLES_MAX				50
	...represents the interval in ms in which the DC-bus voltage must reach the required value.
39.	#define	UC_START_RAMP_STEPS				30
	...represents the number of steps needed to reach the DC-bus required value from the zero value.
40.	#define	PI_KP_START	10
	...represents the proportional gain of the PI PFC stage regulator in the start phase.
41.	#define	PI_KI_START	3
	...represents the integral gain of the PI PFC stage regulator in the start phase.
42.	#define	PI_KP_RUN	2
	...represents the proportional gain of the PI PFC stage regulator in run mode.
43.	#define	PI_KI_RUN	1
		Dimmable Light Ballast with Power Factor Correction, Rev. 1
54						Freescale Semiconductor