STM32F318C8 datasheet(85/125 Pages) STMICROELECTRONICS

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STM32F318C8 STM32F318K8

Electrical characteristics

107

6.3.16

Timer characteristics

The parameters given in Table 53 are guaranteed by design.

Refer to Section 6.3.13: I/O port characteristics for details on the input/output alternate

function characteristics (output compare, input capture, external clock, PWM output).

Table 53. TIMx(1)(2) characteristics

1. TIMx is used as a general term to refer to the TIM1, TIM2, TIM15, TIM16 and TIM17 timers.

2. Guaranteed by design, not tested in production.

Symbol

Parameter

Conditions

Min

Max

Unit

tres(TIM)

Timer resolution time

-1

tTIMxCLK

fTIMxCLK = 72 MHz

13.9

fTIMxCLK = 144 MHz,

x = 1, 15,16, 17

6.95

fEXT

Timer external clock

frequency on CH1 to CH4

-0

fTIMxCLK/2

MHz

fTIMxCLK = 72 MHz

MHz

ResTIM

Timer resolution

TIMx (except TIM2)

bit

TIM2

tCOUNTER 16-bit counter clock period

65536

tTIMxCLK

fTIMxCLK = 72 MHz

0.0139

910

µs

fTIMxCLK = 144 MHz,

x= 1/15/16/17

0.0069

455

µs

tMAX_COUNT

Maximum possible count

with 32-bit counter

65536 × 65536 tTIMxCLK

fTIMxCLK = 72 MHz

59.65

fTIMxCLK = 144 MHz,

x= 1/15/16/17

29.825

Table 54. IWDG min/max timeout period at 40 kHz (LSI) (1)

1. These timings are given for a 40 kHz clock but the microcontroller 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 (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

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