Datasheet
DS9716 Rev 11 95/139
STM32F401xB STM32F401xC Electrical characteristics
113
Figure 32. Recommended NRST pin protection
1. The reset network protects the device against parasitic resets.
2. The external capacitor must be placed as close as possible to the device.
3. The user must ensure that the level on the NRST pin can go below the V
IL(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).
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Table 58. TIMx characteristics
(1)(2)
Symbol Parameter Conditions
(3)
Min Max Unit
t
res(TIM)
Timer resolution time
AHB/APBx prescaler=1
or 2 or 4, f
TIMxCLK
=
84 MHz
1-t
TIMxCLK
11.9 - ns
AHB/APBx prescaler>4,
f
TIMxCLK
= 84 MHz
1-t
TIMxCLK
11.9 - ns
f
EXT
Timer external clock
frequency on CH1 to CH4
f
TIMxCLK
= 84 MHz
0f
TIMxCLK
/2 MHz
042MHz
Res
TIM
Timer resolution - 16/32 bit
t
COUNTER
16-bit counter clock period
when internal clock is
selected
f
TIMxCLK
= 84 MHz 0.0119 780 µs
t
MAX_COUNT
Maximum possible count with
32-bit counter
- - 65536 × 65536 t
TIMxCLK
f
TIMxCLK
= 84 MHz - 51.1 S
1. TIMx is used as a general term to refer to the TIM1 to TIM11 timers.
2. Guaranteed by design.
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.
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