ST92F124 datasheet(391/429 Pages) STMICROELECTRONICS

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ST92F124/F150/F250 - ELECTRICAL CHARACTERISTICS

STANDARD TIMER TIMING TABLE

(VDD = 5V ± 10%, TA = –40°C to +125°C, CLoad = 50pF, fINTCLK = 24MHz, Push-pull output configuration,

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, with minimum and

maximum prescaler value and minimum and maximum counter value.

Measurement points are VOH or VIH for positive pulses and VOL or VIL for negative pulses.

(1) On this product STIN is not available as Alternate Function but it is internally connected to a precise clock source directly derived from the

crystal oscillator. Refer to RCCU chapter for details about clock distribution.

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.

Psc = Standard Timer Prescaler Register content (STP): from 0 to 255

Cnt = Standard Timer Counter Registers content (STH,STL): from 0 to 65535

TSTIN = Standard Timer Input signal period (STIN) , TSTIN ≥ 8 x Tck

STANDARD TIMER TIMING

N°

Symbol

Parameter

Value

Unit

Formula

Min

Max

TwSTOL

STOUT Low Pulse Width

4 x (Psc+1) x (Cnt+1) x Tck

167

2.8

(Psc+1) x (Cnt+1) x TSTIN

(1)

TwSTOH

STOUT High Pulse Width

4 x (Psc+1) x (Cnt+1) x Tck

167

2.8

(Psc+1) x (Cnt+1) x TSTIN

(1)

TwSTIL

STIN High Pulse Width

≥ 4 x Tck

(1)

TwSTIH

STIN Low Pulse Width

≥ 4 x Tck

(1)

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