ST92141 datasheet(166/179 Pages) STMICROELECTRONICS

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ST92141 - ELECTRICAL CHARACTERISTICS

EXTENDED FUNCTION TIMER EXTERNAL TIMING TABLE

(VDD = 5V ± 10%, TA = –40°C to +105°C, CLoad = 50pF, fINTCLK = 25MHz, 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 25MHz, and minimum

prescaler factor (=2).

Measurement points are taken with reference to VIH-VIH for positive pulse and VIL-VIL for negative pulse

(1) Formula guaranteed by design.

Legend:

Tck = INTCLK period = OSCIN period when OSCIN is not divided by 2;

2 x OSCIN period when OSCIN is divided by 2;

OSCIN period x PLL factor when the PLL is enabled.

Prsc = Prescaler 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(1)

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

170

6TwEICD

Distance between two active edges on ICAPx

2 x Tck x Prsc +10

170

EXTCLK

ICAPA

ICAPB

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