TMS470MF06607 datasheet(41/65 Pages) TI2

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guaranteed fail

lower

threshold

guaranteed pass

upper

threshold

guaranteed fail

1.5

5.0

20.0

50.0

f (MHz)

TMS470MF06607

www.ti.com

SPNS157C

– JANUARY 2012

5.2.3

LPO and Clock Detection

The LPOCLKDET module consists of a clock monitor (CLKDET) and 2 low-power oscillators (LPO): a

low-frequency (LF) and a high-frequency (HF) oscillator. The CLKDET is a supervisor circuit for an

externally supplied clock signal. In case the externally supplied clock frequency falls out of a frequency

window, the clock detector flags this condition and switches to the HF LPO clock (limp mode). The

OSCFAIL flag and clock switch-over remain, regardless of the behavior of the oscillator clock signal. The

only way OSCFAIL can be cleared (and OSCIN be again the driving clock) is a power-on reset.

Table 5-8. LPO and Clock Detection

PARAMETER

MIN

TYP

MAX

UNIT

Lower threshold

1.5

5.0

MHz

invalid frequency

Higher threshold

20.0

50.0

MHz

limp mode frequency

9.0

14.0

MHz

(HFosc)

LFosc frequency

110

kHz

HFosc frequency

9.0

14.0

MHz

Figure 5-6. LPO and Clock Detection

Peripheral Information and Electrical Specifications

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