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RM0312 Datenblatt(PDF) 110 Page - STMicroelectronics

Teilenummer RM0312
Bauteilbeschribung  STM8TL5xxx microcontroller family
PDF  275 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

RM0312 Datenblatt(HTML) 110 Page - STMicroelectronics

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16-bit general purpose timer (TIM2/TIM3)
RM0312
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DocID022352 Rev 3
Figure 23. Counter update when ARPE=0 (ARR not preloaded) with prescaler = 2
In Figure 24 the prescaler divider is set to 1, so CK_CNT has the same frequency as
CK_PSC.
In Figure 24 autoreload preload is enabled (ARPE=1), so the next counter overflow occurs
at FFh. The new autoreload value register value of 36h is taken into account after the
overflow which generates an update event.
Figure 24. Counter update event when ARPE=1 (TIMx_ARR preloaded)
CK_PSC
00
CNT_EN
TIMER CLOCK = CK_CNT
COUNTER REGISTER
UPDATE INTERRUPT FLAG (UIF)
COUNTER OVERFLOW
UPDATE EVENT (UEV)
01 02 03 04 05 06 07
32 33 34 35 36
31
AUTO-RELOAD PRELOAD REGISTER
FF
36
AUTO-RELOAD SHADOW REGISTER
Write a new value in TIMx_ARR
FF
36
New value transferred immediately in shadow register
00
CNT_EN
TIMER CLOCK = CK_CNT
COUNTER REGISTER
UPDATE INTERRUPT FLAG (UIF)
COUNTER OVERFLOW
UPDATE EVENT (UEV)
01 02 03 04 05 06 07
FB FC FD FE FF
FA
AUTO-RELOAD PRELOAD REGISTER
FF
36
AUTO-RELOAD SHADOW REGISTER
FF
36
Write a new value in TIMx_ARR
CK_PSC
New value transferred in shadow register
on counter overflow



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