APM32E103CET6-R datasheet(29/79 Pages) GEEHY

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Table 8 Low Power Consumption Mode

Mode

Instruction

Sleep mode

The core stops working, all peripherals are working, and it can be woken up through interrupts/events

Stop mode

Under the condition that SRAM and register data are not lost, the stop mode can achieve the lowest

power consumption;

The clock of the internal 1.3V power supply module will stop, HSECLK crystal resonator, HSICLK and

PLL will be prohibited, and the voltage regulator can be configured in normal mode or low power mode;

Any external interrupt line can wake up MCU, and the external interrupt lines include one of the 16

external interrupt lines, PVD output, RTC and USBD.

Standby mode

The power consumption in this mode is the lowest;

Internal voltage regulator is turned off, all 1.3V power supply modules are powered off, HSECLK crystal

resonator, HSICLK and PLL clocks are turned off, SRAM and register data disappear, RTC area and

backup register contents remain, and standby circuit still works;

The external reset signal on NRST, IWDT reset, rising edge on WKUP pin or RTC event will wake

MCU out of standby mode.

4.8.

DMA

2 built-in DMAs; DMA1 supports 7 channels and DMA2 supports 5 channels. Each channel

supports multiple DMA requests, but only one DMA request is allowed to enter the DMA

channel at the same time. The peripherals supporting DMA requests are ADC, SPI, USART,

I2C, and TMRx. Four levels of DMA channel priority can be configured. Support

"memory→memory, memory→peripheral, peripheral→memory" transfer of data (the memory

includes Flash、SRAM、SDRAM)

4.9.

GPIO

GPIO can be configured as general input, general output, multiplexing function and analog

input、output. The general input can be configured as floating input, pull-up input and pull-down

input; the general output can be configured as push-pull output and open-drain output; the

multiplexing function can be used for digital peripherals; and the analog input and output can be

used for analog peripherals and low-power mode; the enable and disable pull-up/pull-down

resistor can be configured; the speed of 2MHz, 10MHz and 50MHz can be configured; the

higher the speed is, the greater the power and the noise will be.

4.10.

Communication peripherals

4.10.1.

USART/UART

Up to 5 universal synchronous/asynchronous transmitter receivers are built in the chip. The

USART1 interface can communicate at a rate of 4.5Mbit/s, while other USART/UART interfaces

can communicate at a rate of 2.25Mbit/s. All USART/UART interfaces can configure baud rate,

parity check bit, stop bit, and data bit length; except UART5, all the other USART/UART can

support DMA. USART/UART function differences are shown in the table below:

Table 9 USART/UART Function Differences

USART mode/function

USART1

USART2

USART3

UART4

UART5

Hardware flow control of modem

√

—

Synchronous mode

√

Smart card mode

√

—

IrDASIR coder-encoder functions

√

LIN mode

√

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