STM32L031C6 datasheet(26/118 Pages) STMICROELECTRONICS

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Functional overview

STM32L031x4/6

26/118

DocID027063 Rev 4

3.8

Memories

The STM32L031x4/6 devices have the following features:



8 Kbytes of embedded SRAM accessed (read/write) at CPU clock speed with 0 wait

states. With the enhanced bus matrix, operating the RAM does not lead to any

performance penalty during accesses to the system bus (AHB and APB buses).



The non-volatile memory is divided into three arrays:

–

16 or 32 Kbytes of embedded Flash program memory

–

1 Kbytes of data EEPROM

–

Information block containing 32 user and factory options bytes plus 4 Kbytes of

system memory

The user options bytes are used to write-protect or read-out protect the memory (with

4 Kbyte granularity) and/or readout-protect the whole memory with the following options:



Level 0: no protection



Level 1: memory readout protected.

The Flash memory cannot be read from or written to if either debug features are

connected or boot in RAM is selected



Level 2: chip readout protected, debug features (Cortex-M0+ serial wire) and boot in

RAM selection disabled (debugline fuse)

The whole non-volatile memory embeds the error correction code (ECC) feature.

3.9

Direct memory access (DMA)

The flexible 7-channel, general-purpose DMA is able to manage memory-to-memory,

peripheral-to-memory and memory-to-peripheral transfers. The DMA controller supports

circular buffer management, avoiding the generation of interrupts when the controller

reaches the end of the buffer.

Each channel is connected to dedicated hardware DMA requests, with software trigger

support for each channel. Configuration is done by software and transfer sizes between

source and destination are independent.

The DMA can be used with the main peripherals: SPI, I2C, USART, LPUART,

general-purpose timers, and ADC.

3.10

Analog-to-digital converter (ADC)

A native 12-bit, extended to 16-bit through hardware oversampling, analog-to-digital

converter is embedded into STM32L031x4/6 devices. It has up to 10 external channels and

3 internal channels (temperature sensor, voltage reference). Three channel are fast

channel, PA0, PA4 and PA5, while the others are standard channels.

It performs conversions in single-shot or scan mode. In scan mode, automatic conversion is

performed on a selected group of analog inputs.

The ADC frequency is independent from the CPU frequency, allowing maximum sampling

rate of 1.14 MSPS even with a low CPU speed. The ADC consumption is low at all

frequencies (~25 µA at 10 kSPS, ~200 µA at 1MSPS). An auto-shutdown function

guarantees that the ADC is powered off except during the active conversion phase.

STM32L031C6 Datasheet(PDF) 26 Page - STMicroelectronics

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