MM32F103CET datasheet(14/89 Pages) MINDMOTION

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DS_MM32F103xx_o_Ver1.13

Specification

2.2.13 Direct memory access controller (DMA)

The 12-channel general-purpose DMAs manage memory-to-memory, peripheral-to-memory

and memory-to-peripheral transfers. The DMA supports circular buffer management, re-

moving the need for user code intervention when the controller reaches the end of the

buffer.

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

ware trigger on each channel. Configuration is made by software and transfer sizes be-

tween source and destination are independent.

DMA can be used with the main peripherals: UART、I2C、SPI、USB、CAN、ADC general-

purpose and advanced-control timers TIMx.

2.2.14 real-time clock register (RTC)

The real time clock is an independent timer. The RTC module has a set of counters that

count continuously and provides the clock calendar function in the appropriate software

configuration. Modify the value of the counter to reset the current time and date of the

system. The RTC module and the clock configuration system (RCC_BDCR register) are

in the backup area, ie the RTC settings and time remain unchanged after a system reset

or wake-up in standby mode.

2.2.15 Backup register (BKP)

The backup registers are ten 16-bit registers used to store 20 bytes of user application

data when VDD power is not present. They are still powered by VBAT. They are also not

reset when the system is woken up in standby mode, or when the system is reset or power

is reset.

2.2.16 Timers and watchdogs

Medium capacity device include 2 advanced control、4 general-purpose timers 、2 base-

timer 、2 watchdog timers and 1 SysTick timer.

The following table compares the features of the different timers:

Table 2. Timer feature comparison

Timer type

Timer

Counter

resolution

Counter

type

Prescaler

factor

DMA request

generation

Capture/-

compare

channels

Complem

-entary

outputs

Advanced

control

TIM1

/TIM8

16-bit

Up, down,

up/down

integer

from 1 to

65536

Yes

General

purpose

TIM2 /

TIM5

32-bit

Up, down,

up/down

integer

from 1 to

232

− 1

Yes

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