TMS570LS datasheet(70/107 Pages) TI1

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guaranteed fail

lower-

threshold

guaranteed pass

upper-

threshold

guaranteed fail

f[MHz]

1.5

5.0

20.0

50.0

TMS570LS20206-EP, TMS570LS20216-EP

SPNS209A – JUNE 2012 – REVISED AUGUST 2012

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7.1.4

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 re-enable OSCIN as the clock source) is a power-on-reset.

Table 7-3. LPO And Clock Detection

Parameter

MIN

Type

MAX

Unit

Invalid frequency

lower threshold

1.5

MHz

upper threshold

MHz

Limp mode frequency (HFosc)

7.9

14.4

MHz

HFosc frequency

7.9

14.4

MHz

LFosc frequency

113

kHz

Figure 7-2. LPO And Clock Detection

Peripheral and Electrical Specifications

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Product Folder Link(s): TMS570LS20206-EP TMS570LS20216-EP

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