Flash MCU. HT66F303 Datasheet

HT66F303 MCU. Datasheet pdf. Equivalent

HT66F303 Datasheet
Recommendation HT66F303 Datasheet
Part HT66F303
Description Cost-Effective Flash MCU
Feature HT66F303; Cost-Effective Flash MCU with EEPROM HT66F302/HT66F303 Revision: V1.30 Date: �J�a�n�u�a�r�y�0��2,���.
Manufacture Holtek Semiconductor
Datasheet
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Holtek Semiconductor HT66F303
Cost-Effective Flash MCU with EEPROM
HT66F302/HT66F303
Revision: V1.30 Date: �J�a�n�u�a�r�y�0��2,���2�0�1�8



Holtek Semiconductor HT66F303
HT66F302/HT66F303
Cost-Effective Flash MCU with EEPROM
Table of Contents
Features................................................................................................................. 6
CPU Features...............................................................................................................................6
Peripheral Features.......................................................................................................................6
General Description.............................................................................................. 7
Selection Table...................................................................................................... 7
Block Diagram....................................................................................................... 7
Pin Assignment..................................................................................................... 8
Pin Description..................................................................................................... 9
Absolute Maximum Ratings............................................................................... 12
D.C. Characteristics............................................................................................ 13
A.C. Characteristics............................................................................................ 14
ADC Electrical Characteristics.......................................................................... 15
Power on Reset Electrical Characteristics....................................................... 16
System Architecture........................................................................................... 16
Clocking and Pipelining...............................................................................................................16
Program Counter.........................................................................................................................17
Stack...........................................................................................................................................18
Arithmetic and Logic Unit – ALU.................................................................................................18
Flash Program Memory...................................................................................... 19
Structure......................................................................................................................................19
Special Vectors...........................................................................................................................19
Look-up Table..............................................................................................................................19
Table Program Example..............................................................................................................20
In Circuit Programming...............................................................................................................21
On-Chip Debug Support – OCDS...............................................................................................21
RAM Data Memory.............................................................................................. 22
Structure......................................................................................................................................22
General Purpose Data Memory..................................................................................................22
Special Purpose Data Memory...................................................................................................22
Special Function Register Description............................................................. 25
Indirect Addressing Registers – IAR0, IAR1...............................................................................25
Memory Pointers – MP0, MP1....................................................................................................25
Bank Pointer – BP.......................................................................................................................26
Accumulator – ACC.....................................................................................................................26
Program Counter Low Register – PCL........................................................................................26
Look-up Table Registers – TBLP, TBLH......................................................................................27
Status Register – STATUS..........................................................................................................27
Rev. 1.30
2 January 02, 2018



Holtek Semiconductor HT66F303
HT66F302/HT66F303
Cost-Effective Flash MCU with EEPROM
EEPROM Data Memory....................................................................................... 28
EEPROM Data Memory Structure..............................................................................................28
EEPROM Registers....................................................................................................................29
Reading Data from the EEPROM ..............................................................................................31
Writing Data to the EEPROM......................................................................................................31
Write Protection...........................................................................................................................31
EEPROM Interrupt......................................................................................................................31
Programming Considerations......................................................................................................32
Oscillators........................................................................................................... 33
Oscillator Overview.....................................................................................................................33
System Clock Configurations......................................................................................................33
Internal RC Oscillator – HIRC.....................................................................................................34
Internal 32kHz Oscillator – LIRC.................................................................................................34
Supplementary Oscillator............................................................................................................34
Operating Modes and System Clocks.............................................................. 34
System Clocks............................................................................................................................34
System Operation Modes............................................................................................................35
Control Register..........................................................................................................................37
Operating Mode Switching .........................................................................................................39
Standby Current Considerations.................................................................................................43
Wake-up......................................................................................................................................43
Watchdog Timer.................................................................................................. 44
Watchdog Timer Clock Source....................................................................................................44
Watchdog Timer Control Register...............................................................................................44
Watchdog Timer Operation.........................................................................................................45
Reset and Initialisation....................................................................................... 46
Reset Functions..........................................................................................................................46
Reset Initial Conditions...............................................................................................................50
Input/Output Ports.............................................................................................. 52
Pull-high Resistors......................................................................................................................53
Port A Wake-up...........................................................................................................................54
I/O Port Control Registers...........................................................................................................54
Pin-shared Functions..................................................................................................................55
Pin-shared Registers...................................................................................................................55
I/O Pin Structures........................................................................................................................57
Programming Considerations......................................................................................................58
Rev. 1.30
3 January 02, 2018





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