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HT32F1252

Holtek 32-bit Microcontroller with ARM®Cortex™-M3 Core

Holtek Semiconductor 

32-bit ARM Cortex™-M3 MCU

HT32F1251/51B/52/53

2 Features

Core

▀ 32-bit ARM® Cortex™-M3 processor core

▀ Up to 72MHz operation frequency

▀ 1.25 DMIPS/MHz (Dhrystone 2.1)

▀ Single-cycle multiplication and hardware division

▀ Integrated Nested Vectored Interrupt Controller (NVIC)

▀ 24-bit SysTick timer

The Cortex™-M3 processor is a general-purpose 32-bit processor core especially suitable for

products requiring high performance and low power consumption microcontrollers. It offers many

new features such as a Thumb-2 instruction set, hardware divider, low latency interrupt respond

time, atomic bit-banding access and multiple buses for simultaneous accesses. The Cortex™-M3

processor is based on the ARMv7 architecture and supports both Thumb and Thumb-2 instruction

sets. Some system peripherals listed below are also provided by Cortex™-M3:

▀ Internal Bus Matrix connected with ICode bus, DCode bus, System bus, Private Peripheral Bus

(PPB) and debug accesses (AHB-AP)

▀ Nested Vectored Interrupt Controller (NVIC)

▀ Flash Patch and Breakpoint (FPB)

▀ Data Watchpoint and Trace (DWT)

▀ Instrument Trace Macrocell (ITM)

▀ Memory Protection Unit (MPU)

▀ Serial Wire Debug Port (SW-DP)

▀ Embedded Trace Macrocell (ETM)

▀ Trace Port Interface Unit (TPIU)

On-chip Memory

▀ 9 to 32KB on-chip Flash memory for instruction/data and option storage

▀ 2 to 8KB on-chip SRAM

▀ Supports several boot modes

The ARM® Cortex™-M3 processor is structured in Harvard architecture which can use separate

buses to fetch instructions and load/store data. The instruction code and data are both located in the

same memory address space but in different address ranges. The maximum address range of the

Cortex™-M3 is 4GB since it has a 32-bit bus address width. Additionally, a pre-defined memory

map is provided by the Cortex™-M3 processor to reduce the software complexity of repeated

implementation of different device vendors. However, some regions are used by the ARM®

Cortex™-M3 system peripherals. Refer to the ARM® Cortex™-M3 Technical Reference Manual

for more information. The Figure  2. HT32F125x Memory Map shows the memory map of the

HT32F125x series of devices, including Code, SRAM, peripheral, and other pre-defined regions.

Rev. 1.10

7 of 35

April 13, 2012

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