ST STM32F405

General-purpose timers (TIM9 to TIM14) RM0090
654/1749 RM0090 Rev 18
Figure 182. Counter timing diagram with prescaler division change from 1 to 2
Figure 183. Counter timing diagram with prescaler division change from 1 to 4
CK_PSC
00
CEN
Timerclock = CK_CNT
Counter register
Update event (UEV)
0
Prescaler control register
1
0
Write a new value in TIMx_PSC
Prescaler buffer
1
0
Prescaler counter
0
10
10
1
0
1
01
02
03
FA
FBF7 F8 F9 FC
MS31076V2
0
3
0
0
1230123
MS31077V2
CK_PSC
CEN
Timerclock = CK_CNT
Counter register
Update event (UEV)
Prescaler control register
Write a new value in TIMx_PSC
Prescaler buffer
Prescaler counter
00 01
FA
FB
F7 F8 F9
FC
30