STM32F378RC datasheet(104/131 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F378xx

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DocID025608 Rev 4

Table 67. TIMx(1) (2)characteristics

1. TIMx is used as a general term to refer to the TIM2, TIM3, TIM4, TIM5, TIM6, TIM7, TIM12, TIM13, TIM14,

TIM15, TIM16 , TIM17, TIM18 and TIM19 timers.

2. Guaranteed by characterization results.

Symbol

Parameter

Conditions

Min

Max

Unit

tres(TIM)

Timer resolution time

-1

tTIMxCLK

fTIMxCLK = 72 MHz

13.9

fEXT

Timer external clock

frequency on CH1 to CH4

0fTIMxCLK/2

MHz

fTIMxCLK = 72 MHz

MHz

ResTIM

Timer resolution

TIMx (except

TIM2)

-16

bit

TIM2

tCOUNTER 16-bit counter clock period

65536

tTIMxCLK

fTIMxCLK = 72 MHz 0.0139

910

µs

tMAX_COUN

Maximum possible count

with 32-bit counter

65536 × 65536

tTIMxCLK

fTIMxCLK = 72 MHz

59.65

Table 68. IWDG min/max timeout period at 40 kHz (LSI) (1)(2)

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.

2. Guaranteed by characterization results.

Prescaler divider

PR[2:0] bits

Min timeout (ms) RL[11:0]=

0x000

Max timeout (ms) RL[11:0]=

0xFFF

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

6.4

26214.4

Table 69. WWDG min-max timeout value @72 MHz (PCLK)

Prescaler

WDGTB

Min timeout value

Max timeout value

0.05687

3.6409

0.1137

7.2817

0.2275

14.564

0.4551

29.127

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