MCBSTM32EXL Keil, MCBSTM32EXL Datasheet - Page 257

• Manufacturer Part Number: MCBSTM32EXL
• Description: BOARD EVALUATION FOR STM32F103ZE
• Manufacturer: Keil

Specifications of MCBSTM32EXL

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

RM0008
13.3.2
Figure 52. Counter timing diagram with prescaler division change from 1 to 2
Figure 53. Counter timing diagram with prescaler division change from 1 to 4
Counter modes
Upcounting mode
In upcounting mode, the counter counts from 0 to the auto-reload value (content of the
TIMx_ARR register), then restarts from 0 and generates a counter overflow event.
If the repetition counter is used, the update event (UEV) is generated after upcounting is
repeated for the number of times programmed in the repetition counter register
(TIMx_RCR). Else the update event is generated at each counter overflow.
Setting the UG bit in the TIMx_EGR register (by software or by using the slave mode
controller) also generates an update event.
The UEV event can be disabled by software by setting the UDIS bit in the TIMx_CR1
register. This is to avoid updating the shadow registers while writing new values in the
Prescaler control register
Prescaler control register
Timer clock = CK_CNT
Timer clock = CK_CNT
Update event (UEV)
Update event (UEV)
Prescaler counter
Prescaler counter
Prescaler buffer
Prescaler buffer
Counter register
Counter register
Write a new value in TIMx_PSC
Write a new value in TIMx_PSC
Doc ID 13902 Rev 9
CK_PSC
CK_PSC
CEN
CEN
F7
F7
0
0
0
0
0
0
F8
F8
F9 FA FB FC
F9 FA FB FC
Advanced-control timers (TIM1&TIM8)
0
0
00
1
1
00
0 1
2 3
01
1
1
3
3
0 1
0 1
02
01
0 1
2 3
03
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