STM32F103RG datasheet(19/120 Pages) STMICROELECTRONICS

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STM32F103xF, STM32F103xG

Description

Doc ID 16554 Rev 3

19/120

The DMA can be used with the main peripherals: SPI, I2C, USART, general-purpose, basic

and advanced-control timers TIMx, DAC, I2S, SDIO and ADC.

2.3.17

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 forty-two 16-bit

registers used to store 84 bytes of user application data when VDD power is not present.

They are not reset by a system or power reset, and they are not reset when the device

wakes up from the Standby mode.

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-speed RC has a typical frequency of 40 kHz. The RTC can be calibrated using

an external 512 Hz output to compensate for any natural quartz 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.

2.3.18

Timers and watchdogs

The XL-density STM32F103xx performance line devices include up to two advanced-control

timers, up to ten general-purpose timers, two basic timers, two watchdog timers and a

SysTick timer.

Table 4 compares the features of the advanced-control, general-purpose and basic timers.

Table 4.

STM32F103xF and STM32F103xG timer feature comparison

Timer

Counter

resolution

Counter

type

Prescaler factor

DMA request

generation

Capture/compare

channels

Complementary

outputs

TIM1, TIM8

16-bit

Up,

down,

up/down

Any integer between

1 and 65536

Yes

TIM2, TIM3,

TIM4, TIM5

16-bit

Up,

down,

up/down

Any integer between

1 and 65536

Yes

TIM9, TIM12

16-bit

Any integer between

1 and 65536

TIM10, TIM11

TIM13, TIM14

16-bit

Any integer between

1 and 65536

TIM6, TIM7

16-bit

Any integer between

1 and 65536

Yes

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