ST92F124 datasheet(392/429 Pages) STMICROELECTRONICS

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ST92F124/F150/F250 - ELECTRICAL CHARACTERISTICS

EXTENDED FUNCTION TIMER EXTERNAL TIMING TABLE

(VDD = 5V ± 10%, TA = –40°C to +125°C, CLoad = 50pF, fINTCLK = 24MHz, unless otherwise specified)

Note: The value in the left hand column shows the formula used to calculate the timing minimum or maximum from the oscillator clock period,

standard timer prescaler and counter programmed values.

The value in the right hand two columns show the timing minimum and maximum for an internal clock (INTCLK) at 24MHz, and minimum

prescaler factor (=2).

Measurement points are VIH for positive pulses and VIL for negative pulses.

Legend:

Tck = INTCLK period = Crystal Oscillator Clock period when CLOCK1 is not divided by 2;

2 x Crystal Oscillator Clock period when CLOCK1 is divided by 2;

Crystal Oscillator Clock period x PLL factor when the PLL is enabled.

Prsc = Precsaler factor defined by Extended Function Timer Clock Control bits (CC1,CC0) on control register CR2 (values: 2,4,8).

EXTENDED FUNCTION TIMER EXTERNAL TIMING

N°

Symbol

Parameter

Value

Unit

Formula

Min

1TwPEWL

External Clock low pulse width (EXTCLK)

≥ 2 x Tck + 10

2TwPEWH

External Clock high pulse width (EXTCLK)

≥ 2 x Tck + 10

3TwPIWL

Input Capture low pulse width (ICAPx)

≥ 2 x Tck + 10

4TwPIWH

Input Capture high pulse width (ICAPx)

≥ 2 x Tck + 10

5TwECKD

Distance between two active edges on EXTCLK

≥ 4 x Tck + 10

177

6TwEICD

Distance between two active edges on ICAPx

≥ 2 x Tck x Prsc +10

177

EXTCLK

ICAPA

ICAPB

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