STM32F051R4U7(2012) 데이터 시트보기 (PDF) - STMicroelectronics

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STM32F051R4U7
(Rev.:2012)

Low- and medium-density advanced ARM™-based 32-bit MCU with 16 to 64 Kbytes Flash, timers, ADC, DAC and comm. interfaces

STMicroelectronics 

STM32F051x

Electrical characteristics

Table 61. TIMx(1) characteristics (continued)

Symbol

Parameter

Conditions

Min

Max

Unit

1

tCOUNTER 16-bit counter clock period

fTIMxCLK = 48 MHz 0.0208

65536

1365

tTIMxCLK

µs

tMAX_COUNT

Maximum possible count

with 32-bit counter

fTIMxCLK = 48 MHz

-

-

65536 × 65536

89.48

tTIMxCLK

s

1. 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)

Prescaler divider PR[2:0] bits

Min timeout RL[11:0]=

0x000

Max timeout RL[11:0]=

0xFFF

Unit

/4

0

0.1

/8

1

0.2

/16

2

0.4

/32

3

0.8

/64

4

1.6

/128

5

3.2

/256

6 or 7

6.4

409.6

819.2

1638.4

3276.8

ms

6553.6

13107.2

26214.4

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.

Table 63. WWDG min-max timeout value @48 MHz (PCLK)

Prescaler

WDGTB

Min timeout value

Max timeout value

Unit

1

0

0.0853

5.4613

2

1

4

2

0.1706

0.3413

10.9226

ms

21.8453

8

3

0.6826

43.6906

Doc ID 022265 Rev 3

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