STM8AL3136 datasheet(20/124 Pages) STMICROELECTRONICS

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Functional overview

STM8AL313x/4x/6x STM8AL3L4x/6x

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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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