STM32F051C6 datasheet(84/104 Pages) STMICROELECTRONICS

84 / 104 page

STM32F051x

Electrical characteristics

Doc ID 022265 Rev 3

85/105

tCOUNTER 16-bit counter clock period

65536

tTIMxCLK

fTIMxCLK = 48 MHz

0.0208

1365

µs

tMAX_COUNT

Maximum possible count

with 32-bit counter

65536 × 65536

tTIMxCLK

fTIMxCLK = 48 MHz

89.48

TIMx is used as a general term to refer to the TIM1, TIM2, TIM3, TIM6, TIM14, TIM15, TIM16 and TIM17

timers.

Table 62.

IWDG min/max timeout period at 40 kHz (LSI) (1)

These timings are given for a 40 kHz clock but the microcontroller’s internal RC frequency can vary from

30 to 60 kHz. Moreover, given an exact RC oscillator frequency, the exact timings still depend on the

phasing of the APB interface clock versus the LSI clock so that there is always a full RC period of

uncertainty.

Prescaler divider

PR[2:0] bits

Min timeout RL[11:0]=

0x000

Max timeout RL[11:0]=

0xFFF

Unit

0.1

409.6

0.2

819.2

/16

0.4

1638.4

/32

0.8

3276.8

/64

1.6

6553.6

/128

3.2

13107.2

/256

6 or 7

6.4

26214.4

Table 63.

WWDG min-max timeout value @48 MHz (PCLK)

Prescaler

WDGTB

Min timeout value

Max timeout value

Unit

0.0853

5.4613

0.1706

10.9226

0.3413

21.8453

0.6826

43.6906

Table 61.

TIMx(1) characteristics (continued)

Symbol

Parameter

Conditions

Min

Max

Unit

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