TIMER - AN0014 - Application Note - Energy Micro
TIMER - AN0014 - Application Note - Energy Micro
TIMER - AN0014 - Application Note - Energy Micro
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3 Interrupts, PRS and DMA<br />
...the world's most energy friendly microcontrollers<br />
The timer has 5 output events that can trigger an interrupt. All except the buffer overflow also trigger a<br />
PRS Signal and a DMA request:<br />
• Counter Underflow<br />
• Counter Overflow<br />
• Compare match, input capture or buffer overflow (one per Compare/Capture channel)<br />
To enable one or more interrupts, <strong>TIMER</strong>n_IEN register must be written with the corresponding interrupt<br />
enable bits. Also, the NVIC vector for the corresponding interrupt line must be enabled.<br />
There is also a function available on the emlib to activate timer interrupts: void<br />
<strong>TIMER</strong>_IntEnable(<strong>TIMER</strong>_TypeDef *timer, uint32_t flags);<br />
The <strong>TIMER</strong> always generates Reflex outputs (one HFPERCLK cycle pulse), on the above output events<br />
regardless of the <strong>TIMER</strong>n_IEN register or if it is selected by a PRS channel.<br />
If an interrupt is generated the interrupt flag can be read from the <strong>TIMER</strong>n_IF register and cleared by<br />
writing <strong>TIMER</strong>n_IFC.<br />
2013-05-08 - an0014_Rev1.07 4 www.energymicro.com
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