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STM8AL3136 Datasheet(PDF) 20 Page - STMicroelectronics |
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STM8AL3136 Datasheet(HTML) 20 Page - STMicroelectronics |
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20 / 124 page  Functional overview STM8AL313x/4x/6x STM8AL3L4x/6x 20/124 DocID18474 Rev 7 3.10 Digital-to-analog converter (DAC) • 12-bit DAC with output buffer • Synchronized update capability using TIM4 • DMA capability • External triggers for conversion • Input reference voltage VREF+ for better resolution Note: DAC can be served by DMA1. 3.11 Ultra-low-power comparators The medium-density STM8AL313x/4x/6x and STM8AL3L4x/6x embed two comparators (COMP1 and COMP2) that share the same current bias and voltage reference. The voltage reference can be internal or external (coming from an I/O). • One comparator with fixed threshold (COMP1). • One comparator rail to rail with fast or slow mode (COMP2). The threshold can be one of the following: – DAC output, – External I/O, – Internal reference voltage or internal reference voltage sub multiple (1/4, 1/2, 3/4). The two comparators can be used together to offer a window function. They can wake up from Halt mode. 3.12 System configuration controller and routing interface The system configuration controller provides the capability to remap some alternate functions on different I/O ports. TIM4 and ADC1 DMA channels can also be remapped. The highly flexible routing interface allows application software to control the routing of different I/Os to the TIM1 timer input captures. It also controls the routing of internal analog signals to ADC1, COMP1, COMP2, DAC and the internal reference voltage VREFINT. It also provides a set of registers for efficiently managing the charge transfer acquisition sequence (see Section 3.13: Timers). |
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