STM32F100X4 datasheet(21/84 Pages) STMICROELECTRONICS

21 / 84 page

STM32F100x4, STM32F100x6, STM32F100x8, STM32F100xB

Description

Doc ID 16455 Rev 2

21/84

2.21

GPIOs (general-purpose inputs/outputs)

Each of the GPIO pins can be configured by software as output (push-pull or open-drain), as

input (with or without pull-up or pull-down) or as peripheral alternate function. Most of the

GPIO pins are shared with digital or analog alternate functions. All GPIOs are high current-

capable except for analog inputs.

The I/Os alternate function configuration can be locked if needed following a specific

sequence in order to avoid spurious writing to the I/Os registers.

2.22

Remap capability

This feature allows the use of a maximum number of peripherals in a given application.

Indeed, alternate functions are available not only on the default pins but also on other

specific pins onto which they are remappable. This has the advantage of making board

design and port usage much more flexible.

For details refer to Table 4: STM32F100xx pin definitions; it shows the list of remappable

alternate functions and the pins onto which they can be remapped. See the STM32F10xxx

reference manual for software considerations.

2.23

ADC (analog-to-digital converter)

The 12-bit analog to digital converter has up to 16 external channels and performs

conversions in single-shot or scan modes. In scan mode, automatic conversion is performed

on a selected group of analog inputs.

The ADC can be served by the DMA controller.

An analog watchdog feature allows very precise monitoring of the converted voltage of one,

some or all selected channels. An interrupt is generated when the converted voltage is

outside the programmed thresholds.

2.24

DAC (digital-to-analog converter)

The two 12-bit buffered DAC channels can be used to convert two digital signals into two

analog voltage signal outputs. The chosen design structure is composed of integrated

resistor strings and an amplifier in noninverting configuration.

This dual digital Interface supports the following features:

●

two DAC converters: one for each output channel

●

up to 10-bit output

●

left or right data alignment in 12-bit mode

●

synchronized update capability

●

noise-wave generation

●

triangular-wave generation

●

dual DAC channels’ independent or simultaneous conversions

●

DMA capability for each channel

●

external triggers for conversion

●

input voltage reference VREF+

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