EM357-RTR datasheet(121/241 Pages) SILABS

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EM357-RTR 数据表(PDF) 121 Page - Silicon Laboratories

部件名	EM357-RTR

功能描述	High-Performance, Integrated ZigBee/802.15.4 System-on-Chip

PDF	241 Pages

Scroll/Zoom	100%

制造商	SILABS [Silicon Laboratories]

网页	http://www.silabs.com

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121 / 241 page

121

Rev 1.3

When a UEV occurs, the update flag (the INT_TIMUIF bit in the INT_TIMxFLAG register) is set (unless TIM_URS

is 1) and the following registers are updated:



The prescaler shadow register is reloaded with the buffer value (contents of the TIMx_PSC register).



The auto-reload active register is updated with the buffer value (contents of the TIMx_ARR register). If the

update source is a counter overflow, the auto-reload is updated before the counter is reloaded, so that the

next period is the expected one. The counter is loaded with the new value.

Figures 9.9, 9.10, and 9.11 show some examples of the counter behavior for different clock frequencies.

Figure 9.9. Counter Timing Diagram, Internal Clock Divided by 1, TIMx_ARR = 0x6

Figure 9.10. Counter Timing Diagram, Update Event with TIM_ARBE = 1 (Counter Underflow)

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