STM32F100X8 データシートの表示（PDF） - STMicroelectronics

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STM32F100X8

Low & medium-density value line, advanced ARM®-based 32-bit MCU with 16 to 128 KB Flash, 12 timers, ADC, DAC & 8 comm interfaces

STMicroelectronics 

STM32F100x4, STM32F100x6, STM32F100x8, STM32F100xB

Description

2.2.14

2.2.15

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

trigger on each channel. Configuration is made by software and transfer sizes between

source and destination are independent.

The DMA can be used with the main peripherals: SPI, DAC, I2C, USART, all timers and

ADC.

RTC (real-time clock) and backup registers

The RTC and the backup registers are supplied through a switch that takes power either on

VDD supply when present or through the VBAT pin. The backup registers are ten 16-bit

registers used to store 20 bytes of user application data when VDD power is not present.

The real-time clock provides a set of continuously running counters which can be used with

suitable software to provide a clock calendar function, and provides an alarm interrupt and a

periodic interrupt. It is clocked by a 32.768 kHz external crystal, resonator or oscillator, the

internal low power RC oscillator or the high-speed external clock divided by 128. The

internal low power RC has a typical frequency of 40 kHz. The RTC can be calibrated using

an external 512 Hz output to compensate for any natural crystal deviation. The RTC

features a 32-bit programmable counter for long term measurement using the Compare

register to generate an alarm. A 20-bit prescaler is used for the time base clock and is by

default configured to generate a time base of 1 second from a clock at 32.768 kHz.

Timers and watchdogs

The STM32F100xx devices include an advanced-control timer, six general-purpose timers,

two basic timers and two watchdog timers.

Table 3 compares the features of the advanced-control, general-purpose and basic timers.

Table 3. Timer feature comparison

Timer

Counter

resolution

Counter

type

Prescaler

factor

DMA request Capture/compare Complementary

generation

channels

outputs

Up, Any integer

TIM1 16-bit

down, between 1

Yes

4

Yes

up/down and 65536

TIM2,

Up, Any integer

TIM3, 16-bit

down, between 1

Yes

4

No

TIM4

up/down and 65536

Any integer

TIM15 16-bit

Up

between 1

Yes

2

Yes

and 65536

TIM16,

TIM17

16-bit

Any integer

Up

between 1

Yes

and 65536

1

Yes

TIM6,

TIM7

16-bit

Any integer

Up

between 1

Yes

and 65536

0

No

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