Rev. 1.00

2 of 35

May 27, 2011

32-bit ARM Cortex™-M3 MCU

HT32F1251/51B/52/53

Table of Contents

1 General Description................................................................................................ 6

2 Features................................................................................................................... 7

Core ....................................................................................................................................... 7

On-chip Memory .................................................................................................................... 7

Flash Memory Controller ....................................................................................................... 8

Reset Control Unit ................................................................................................................. 8

Clock Control Unit.................................................................................................................. 8

Power Management............................................................................................................... 9

Analog to Digital Converter.................................................................................................... 9

Analog Operational Amplifier/Comparator ............................................................................. 9

I/O Ports............................................................................................................................... 10

PWM Generation and Capture Timers................................................................................. 10

Watchdog Timer................................................................................................................... 11

Real Time Clock................................................................................................................... 11

Inter-integrated Circuit (I2C) ................................................................................................. 12

Serial Peripheral Interface (SPI) .......................................................................................... 12

Universal Synchronous Asynchronous Receiver Transmitter (USART)............................... 13

Debug Support..................................................................................................................... 13

Package and Operation Temperature.................................................................................. 13

3 Overview................................................................................................................ 14

Device Information............................................................................................................... 14

Block Diagram ..................................................................................................................... 15

Memory Map........................................................................................................................ 16

Clock Structure .................................................................................................................... 17

Pin Assignment .................................................................................................................... 18

4 Electrical Characteristics..................................................................................... 22

Absolute Maximum Ratings ................................................................................................. 22

DC Characteristics............................................................................................................... 22

On-Chip LDO Voltage Regulator Characteristics................................................................. 22

Power Consumption ............................................................................................................ 23

Reset and Supply Monitor Characteristics........................................................................... 23

External Clock Characteristics............................................................................................. 24

Internal Clock Characteristics .............................................................................................. 25

PLL Characteristics.............................................................................................................. 26

Memory Characteristics ....................................................................................................... 26