Datasheet
Electrical characteristics STM32F373xx
106/137 DocID022691 Rev 7
Table 68. 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
t
res(TIM)
Timer resolution time
-1-t
TIMxCLK
f
TIMxCLK
= 72 MHz 13.9 - ns
f
EXT
Timer external clock
frequency on CH1 to CH4
0f
TIMxCLK
/2 MHz
f
TIMxCLK
= 72 MHz 0 24 MHz
Res
TIM
Timer resolution
TIMx (except
TIM2)
-16
bit
TIM2 - 32
t
COUNTER
16-bit counter clock period
- 1 65536 t
TIMxCLK
f
TIMxCLK
= 72 MHz 0.0139 910 µs
t
MAX_COUN
T
Maximum possible count
with 32-bit counter
- - 65536 × 65536 t
TIMxCLK
f
TIMxCLK
= 72 MHz - 59.65 s
Table 69. 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
/4 0 0.1 409.6
/8 1 0.2 819.2
/16 2 0.4 1638.4
/32 3 0.8 3276.8
/64 4 1.6 6553.6
/128 5 3.2 13107.2
/256 7 6.4 26214.4
Table 70. WWDG min-max timeout value @72 MHz (PCLK)
Prescaler WDGTB Min timeout value Max timeout value
1 0 0.05687 3.6409
2 1 0.1137 7.2817
4 2 0.2275 14.564
8 3 0.4551 29.127
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