1.2 Key features

1.2.1 General features

General features are as follows:

1) 4-byte Chip UID (Unique ID).

2) Embedded 32-bit proprietary microcontroller.

 Better power-balanced performance than ARM M0

 Instruction cache controller

 Maximum running speed up to 48MHz

3) Program memory: internal 512kB Flash.

4) Data memory: 32kB on-chip SRAM, including up to 32kB SRAM with retention in deep

sleep

5) RTC and other timers:

 Clock source of 24MHz&32.768kHz Crystal and 32kHz/24MHz embedded RC

oscillator, among which, the external 24MHz is to verify internal 32K clock, the

internal 32KHz is for low precision application, external 32.768 is for high precision

application

 Three general 32-bit timers with four selectable modes in active mode

 Watchdog timer

 A low-frequency 32kHz timer available in low power mode

6) A rich set of I/Os:

 Up to 32/17/10 GPIOs depending on package option. All digital IOs can be used as

GPIOS.

 DMIC (Digital Mic).

 AMIC (Analog Mic).

 I2S.

 Stereo Audio output.

 SPI.

 I2C.

 UART with hardware flow control and 7816 protocol support.

 USB.

 Swire debug Interface.

7) Up to 6 channels of differential PWM:

 PWM1~PWM5: 5-channel normal PWM output.

 PWM0: 1 channel with IR/IR FIFO/IR DMA FIFO mode for IR generation.

8) Sensor:

 14bit 10-channel (only GPIO input) SAR ADC, with 4-channel differential input PGA,

effective bits: 10.5bits

 Temperature sensor

9) One quadrature decoder.

10) Embedded hardware AES block cipher with 128 bit keys and software AES-CCM.

11) Embedded hardware acceleration for Elliptical curve cryptography (ECC).

12) Embedded low power comparator.

13) Operating temperature: -40℃~+85℃

14) Supports BLE, BLE Mesh and 2.4GHz proprietary technologies into a single SoC without

the requirement for an external DSP.