STM32F401 datasheet(97/135 Pages) STMICROELECTRONICS

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STM32F401xD STM32F401xE

Electrical characteristics

114

Figure 32. Recommended NRST pin protection

1. The reset network protects the device against parasitic resets.

2. The user must ensure that the level on the NRST pin can go below the VIL(NRST) max level specified in

Table 57. Otherwise the reset is not taken into account by the device.

6.3.18

TIM timer characteristics

The parameters given in Table 58 are guaranteed by design.

Refer to Section 6.3.16: I/O port characteristics for details on the input/output alternate

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

Table 58. TIMx characteristics(1)(2)

1. TIMx is used as a general term to refer to the TIM1 to TIM11 timers.

2. Guaranteed by design, not tested in production.

Symbol

Parameter

Conditions(3)

3. The maximum timer frequency on APB1 is 42 MHz and on APB2 is up to 84 MHz, by setting the TIMPRE

bit in the RCC_DCKCFGR register, if APBx prescaler is 1 or 2 or 4, then TIMxCLK = HCKL, otherwise

TIMxCLK >= 4x PCLKx.

Min

Max

Unit

tres(TIM)

Timer resolution time

AHB/APBx prescaler=1

or 2 or 4, fTIMxCLK =

84 MHz

tTIMxCLK

11.9

AHB/APBx prescaler>4,

fTIMxCLK = 84 MHz

tTIMxCLK

11.9

fEXT

Timer external clock

frequency on CH1 to CH4 f

TIMxCLK = 84 MHz

fTIMxCLK/2

MHz

042

MHz

ResTIM

Timer resolution

16/32

bit

tCOUNTER

16-bit counter clock

period when internal clock

is selected

fTIMxCLK = 84 MHz

0.0119

780

µs

tMAX_COUNT

Maximum possible count

with 32-bit counter

65536 ×

65536

tTIMxCLK

fTIMxCLK = 84 MHz

-51.1

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