ST STM32F446 Series - Timx Auto-Reload Register (Timx_Arr); Timx Counter (Timx_Cnt); Timx Prescaler (Timx_Psc)

General-purpose timers (TIM2 to TIM5) RM0390
574/1328 RM0390 Rev 4
17.4.10 TIMx counter (TIMx_CNT)
Address offset: 0x24
Reset value: 0x0000
17.4.11 TIMx prescaler (TIMx_PSC)
Address offset: 0x28
Reset value: 0x0000
17.4.12 TIMx auto-reload register (TIMx_ARR)
Address offset: 0x2C
Reset value: 0x0000
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CNT[15:0]
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Bits 15:0 CNT[15:0]: Counter value
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PSC[15:0]
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Bits 15:0 PSC[15:0]: Prescaler value
The counter clock frequency CK_CNT is equal to f
CK_PSC
/ (PSC[15:0] + 1).
PSC contains the value to be loaded in the active prescaler register at each update event.
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ARR[15:0]
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Bits 15:0 ARR[15:0]: Auto-reload value
ARR is the value to be loaded in the actual auto-reload register.
Refer to the Section 17.3.1: Time-base unit on page 522 for more details about ARR update
and behavior.
The counter is blocked while the auto-reload value is null.