Core

• 32-bit Arm^® Cortex^®-M0+ processor core
• Up to 60 MHz operating frequency
• Single-cycle multiplication
• Integrated Nested Vectored Interrupt Controller (NVIC)
• 24-bit SysTick timer

On-Chip Memory

• Up to 128 KB on-chip Flash memory for instruction/data and option byte storage
• Up to 16 KB on-chip SRAM
• Supports multiple booting modes

Flash Memory Controller – FMC

• Flash accelerator for maximum efficiency
• 32-bit word programming with In System Programming (ISP) and In Application Programming (IAP)
• Flash protection capability to prevent illegal access

Reset Control Unit – RSTCU

• Supply supervisor
  - Power On Reset / Power Down Reset – POR/PDR
  - Brown-out Detector – BOD
  - Programmable Low Voltage Detector – LVD

Clock Control Unit – CKCU

• External 4 to 16 MHz crystal oscillator
• External 32,768 Hz crystal oscillator
• Internal 8 MHz RC oscillator trimmed to ±2 % accuracy at 5 V operating voltage and 25 °C operating temperature
• Internal 32 kHz RC oscillator
• Integrated system clock PLL
• Independent clock divider and gating bits for peripheral clock sources

Power Management Control Unit – PWRCU

• Single V_DD power supply: 2.5 V to 5.5 V
• Integrated 1.5 V LDO regulator for MCU core, peripherals and memories power supply
• V_DD power supply for RTC
• Two power domains: V_DD and V_CORE
• Three power saving modes: Sleep, Deep-Sleep1 and Deep-Sleep2

External Interrupt / Event Controller – EXTI

• Up to 16 EXTI lines with configurable trigger sources and types
• All GPIO pins can be selected as EXTI trigger source
• Source trigger type includes high level, low level, negative edge, positive edge or both edges
• Individual interrupt enable, wake-up enable and status bits for each EXTI line
• Software interrupt trigger mode for each EXTI line
• Integrated deglitch filter for short pulse blocking

Analog to Digital Converter – ADC

• 12-bit SAR ADC engine
• Up to 1 Msps conversion rate
• Up to 10 external analog input channels

Comparator – CMP (HT32F54243/HT32F54253 only)

• Rail-to-rail comparator
• Each comparator has configurable negative input used for flexible voltage selection
  - External CNn pin
  - Internal 8-bit CVR output
• Programmable hysteresis
• Programmable respond speed and consumption
• Comparator output can be routed to I/O or to multiple timers or ADC trigger inputs
• 8-bit scaler can be configured to dedicated I/O for voltage reference
• Comparator has interrupt generation capability with wakeup from Sleep, Deep Sleep1 or Deep Sleep2 mode through the EXTI controller

I/O Ports – GPIO

• Up to 54 GPIOs
• Port A, B, C, D are mapped to 16-line EXTI interrupts
• Almost all I/O pins have a configurable output driving current

Motor Control Timer – MCTM

• 16-bit up, down, up/down auto-reload counter
• Up to 4 independent channels
• 16-bit programmable prescaler that allows division of the prescaler clock source by any factor between 1 and 65536 to generate the counter clock frequency
• Input Capture function
• Compare Match Output
• PWM waveform generation with Edge-aligned and Center-aligned Counting Modes
• Single Pulse Mode Output
• Complementary Outputs with programmable dead-time insertion
• Supports 3-phase motor control and hall sensor interface
• Break input to force the timer’s output signals into a reset or fixed condition

General-Purpose Timer – GPTM

• 16-bit up, down, up/down auto-reload counter
• Up to 4 independent channels
• 16-bit programmable prescaler that allows division of the prescaler clock source by any factor between 1 and 65536 to generate the counter clock frequency
• Input Capture function
• Compare Match Output
• PWM waveform generation with Edge-aligned and Center-aligned Counting Modes
• Single Pulse Mode Output
• Encoder interface controller with two inputs using quadrature decoder

Single-Channel Timer – SCTM

• 16-bit up auto-reload counter
• One channel for each timer
• 16-bit programmable prescaler that allows division of the prescaler clock source by any factor between 1 and 65536 to generate the counter clock frequency
• Input Capture function
• Compare Match Output
• PWM waveform generation with Edge-aligned

Basic Function Timer – BFTM

• 32-bit compare match count-up counter – no I/O control
• One shot mode – counter stops counting when compare match occurs
• Repetitive mode – counter restarts when compare match occurs

Watchdog Timer – WDT

• 12-bit count-down counter with 3-bit prescaler
• Provides reset to the system
• Programmable watchdog timer window function
• Register write protection function

Real-Time Clock – RTC

• 24-bit count-up counter with a programmable prescaler
• Alarm function
• Interrupt and Wake-up event

Inter-Integrated Circuit – I²C

• Supports both master and slave modes with a frequency of up to 1 MHz
• Provides an arbitration function and clock synchronization
• Supports 7-bit and 10-bit addressing modes and general call addressing
• Supports slave multi-addressing mode using address mask function

Serial Peripheral Interface – SPI

• Supports both master and slave modes
• Frequency of up to (f_PCLK/2) MHz for the master mode and (f_PCLK/3) MHz for the slave mode
• FIFO Depth: 8 levels
• Multi-master and multi-slave operation

Universal Synchronous Asynchronous Receiver Transmitter – USART

• Supports both asynchronous and clocked synchronous serial communication modes
• Programmable baud rate clock frequency up to (f_PCLK/16) MHz for asynchronous mode and (f_PCLK/8) MHz for synchronous mode
• Capability of full duplex communication
• Fully programmable serial communication characteristics including
  - Word length: 7, 8 or 9-bit character
  - Parity: Even, odd or no-parity bit generation and detection
  - Stop bit: 1 or 2 stop bit generation
  - Bit order: LSB-first or MSB-first transfer
• Error detection: Parity, overrun and frame error
• Auto hardware flow control mode – RTS, CTS
• IrDA SIR encoder and decoder
• RS485 mode with output enable control
• FIFO Depth: 8-level for both receiver and transmitter

Universal Asynchronous Receiver Transmitter – UART

• Asynchronous serial communication operating baud rate clock frequency of up to f_PCLK/16 MHz
• Capability of full duplex communication
• Fully programmable serial communication characteristics including
  - Word length: 7, 8 or 9-bit character
  - Parity: Even, odd or no-parity bit generation and detection
  - Stop bit: 1 or 2 stop bit generation
  - Bit order: LSB-first or MSB-first transfer
• Error detection: Parity, overrun and frame error

Cyclic Redundancy Check – CRC

• Supports CRC16 polynomial: 0x8005,
  X¹⁶+X¹⁵+X²+1
• Supports CCITT CRC16 polynomial: 0x1021,
  X¹⁶+X¹²+X⁵+1
• Supports IEEE-802.3 CRC32 polynomial: 0x04C11DB7,
  X³²+X²⁶+X²³+X²²+X¹⁶+X¹²+X¹¹+X¹⁰+X⁸+X⁷+X⁵+X⁴+X²+X+1
• Supports 1’s complement, byte reverse & bit reverse operation on data and checksum
• Supports byte, half-word & word data size
• Programmable CRC initial seed value
• CRC computation executed in 1 AHB clock cycle for 8-bit data and 4 AHB clock cycles for 32-bit data
• The HT32F54243/HT32F54253 device support PDMA to complete a CRC computation of a block of memory

Peripheral Direct Memory Access – PDMA (HT32F54243/HT32F54253 only)

• 6 channels with trigger source grouping
• 8-bit, 16-bit and 32-bit width data transfer
• Supports linear address, circular address and fixed address modes
• 4-level programmable channel priority
  Auto reload mode
• Supports trigger source
  ADC, SPI, USART, UART, I²C, MCTM, GPTM and software request

Hardware Divider – DIV

• Signed/unsigned 32-bit divider
• Calculate in 8 clock cycles, load in 1 clock cycle
• Division by zero error flag

LED Controller – LEDC

• Supports 8-segment digital displays up to a maximum of N
  ●For the HT32F54231/HT32F54241, N = 8
  ●For the HT32F54243/HT32F54253, N = 12
• Supports 8-segment digital displays with common anode or common cathode
• Supports frame interrupt
• Three frequency sources: LSI, LSE and PCLK
• The LED light on/off times can be controlled using the dead time setting

Touch Key - TKEY

• Four key oscillator frequencies: 1 MHz / 3 MHz / 7 MHz / 11 MHz
• 1024 level reference oscillator internal capacitor for frequency matching
• Single 16-bit C/F Counter
• Three scan modes: Manual mode, Auto scan mode and Periodic auto scan mode
• Support detection in the Sleep, Deep-Sleep1 and Deep-Sleep2 modes
• Hardware Upper or lower threshold comparators
• Keys are organised into several groups, with each group known as a module
  ● For the HT32F54231/HT32F54241, having a module number, M0 to M5
  ● For the HT32F54243/HT32F54253, having a module number, M0 to M6
• Each module is a fully independent set of four Touch Keys and each Touch Key has its own oscillator

Debug Support

• Serial Wire Debug Port – SW-DP
• 4 comparators for hardware breakpoints or code / literal patches
• 2 comparators for hardware watch points

Package and Operation Temperature

• 28-pin SSOP, 32 / 46-pin QFN and 48 / 64-pin LQFP packages
• Operation temperature range: -40 °C to 85 °C