Freescale Semiconductor MC68HC908MR32, MC68HC908MR16 manual TImer Interface Module Characteristics

Electrical Specifications

19.9 TImer Interface Module Characteristics

Characteristic	Symbol	Min	Max	Unit
Input capture pulse width	tTIH, tTIL	125	—	ns
Input clock pulse width	tTCH, tTCL	(1/fOP) + 5	—	ns

19.10 Clock Generation Module Component Specifications

Characteristic	Symbol	Min	Typ	Max	Notes
Crystal load capacitance	CL	—	—	—	Consult crystal
					manufacturing data
Crystal fixed capacitance	C1	—	2 * CL	—	Consult crystal
					manufacturing data
Crystal tuning capacitance	C2	—	2 * CL	—	Consult crystal
					manufacturing data
Feedback bias resistor	RB	—	22 MΩ	—
Series resistor	RS	0	330 kΩ	1 MΩ	Not required
Filter capacitor	CF	—	CFACT*	—
			(VDDA/fXCLK)
					CBYP must provide low ac
	CBYP		0.1 ∝F		impedance from
Bypass capacitor		—		—	f = fXCLK/100 to 100*fVCLK, so
					series resistance must be
					considered

19.11 CGM Operating Conditions

Characteristic	Symbol	Min	Typ	Max	Unit
Crystal reference frequency	fXCLK	1	—	8	MHz
Range nominal multiplier	fNOM	—	4.9152	—	MHz
VCO center-of-range frequency	fVRS	4.9152	—	32.8	MHz
VCO frequency multiplier	N	1	—	15	—
VCO center of range multiplier	L	1	—	15	—
VCO operating frequency	fVCLK	fVRSMIN	—	fVRSMAX	—

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

272 Freescale Semiconductor