STM32F302VB 데이터 시트보기 (PDF) - STMicroelectronics
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STM32F302VB Datasheet PDF : 133 Pages
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STM32F302xx/STM32F303xx
Electrical characteristics
Table 57. IWDG min/max timeout period at 40 kHz (LSI) (1)
Prescaler divider PR[2:0] bits
Min timeout (ms) RL[11:0]=
0x000
Max timeout (ms) RL[11:0]=
0xFFF
/4
0
0.1
/8
1
0.2
409.6
819.2
/16
2
0.4
/32
3
0.8
/64
4
1.6
/128
5
3.2
/256
7
6.4
1638.4
3276.8
6553.6
13107.2
26214.4
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.
Table 58. WWDG min-max timeout value @72 MHz (PCLK)
Prescaler
WDGTB
Min timeout value
1
0
2
1
4
2
8
3
0.05687 (1)
0.1137 (1)
0.2275 (1)
0.4551 (1)
1. Guaranteed by design, not tested in production.
Max timeout value
3.6409 (1)
7.2817 (1)
14.564 (1)
29.127 (1)
Doc ID 023353 Rev 5
95/133
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