STM32F103R4 STMicroelectronics, STM32F103R4 Datasheet - Page 17

• Manufacturer Part Number: STM32F103R4
• Description: Mainstream Performance line, ARM Cortex-M3 MCU with 16 Kbytes Flash, 72 MHz CPU, motor control, USB and CAN
• Manufacturer: STMicroelectronics

Specifications of STM32F103R4

• Conversion Range: 0 to 3.6 V
• Peripherals Supported: timers, ADC, SPIs, I2Cs and USARTs

STM32F103x4, STM32F103x6
2.3.13
2.3.14
2.3.15
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 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, I
advanced-control timers TIMx 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
V
registers used to store 20 bytes of user application data when V
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 low-density STM32F101xx performance line devices include an advanced-control timer,
two general-purpose timers, two watchdog timers and a SysTick timer.
Table 4
Table 4.
Timer
TIM2,
DD
TIM1
TIM3
supply when present or through the V
compares the features of the advanced-control and general-purpose timers.
resolution
Counter
16-bit
16-bit
Timer feature comparison
Counter
up/down
up/down
down,
down,
type
Up,
Up,
Doc ID 15060 Rev 5
Any integer
Any integer
and 65536
and 65536
between 1
between 1
Prescaler
factor
BAT
DMA request
generation
pin. The backup registers are ten 16-bit
Yes
Yes
2
C, USART, general-purpose and
Capture/compare
channels
DD
4
4
power is not present.
Complementary
Description
outputs
Yes
No
17/87