Flash MCU. HT45F3420 Datasheet

HT45F3420 MCU. Datasheet pdf. Equivalent

HT45F3420 Datasheet
Recommendation HT45F3420 Datasheet
Part HT45F3420
Description Personal Care Flash MCU
Feature HT45F3420; Personal Care Flash MCU HT45F3420/HT45F3430 Revision: V1.31 Date: April 11, 2017 HT45F3420/HT45F343.
Manufacture Holtek Semiconductor
Datasheet
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Holtek Semiconductor HT45F3420
Personal Care Flash MCU
HT45F3420/HT45F3430
Revision: V1.31 Date: April 11, 2017



Holtek Semiconductor HT45F3420
HT45F3420/HT45F3430
Personal Care Flash MCU
Table of Contents
Features............................................................................................................. 6
CPU Features.......................................................................................................................... 6
Peripheral Features.................................................................................................................. 6
General Description ......................................................................................... 7
Selection Table.................................................................................................. 7
Block Diagram................................................................................................... 8
Pin Assignment................................................................................................. 8
Pin Description................................................................................................. 9
Absolute Maximum Ratings........................................................................... 13
D.C. Characteristics........................................................................................ 13
A.C. Characteristics........................................................................................ 15
A/D Converter Electrical Characteristics...................................................... 16
OCP Electrical Characteristics ..................................................................... 17
OVP Electrical Characteristics ..................................................................... 18
DLL Electrical Characteristics....................................................................... 18
LVR Electrical Characteristics....................................................................... 18
Power on Reset Electrical Characteristics................................................... 19
System Architecture....................................................................................... 19
Clocking and Pipelining.......................................................................................................... 19
Program Counter.................................................................................................................... 20
Stack...................................................................................................................................... 21
Arithmetic and Logic Unit – ALU............................................................................................ 21
Flash Program Memory.................................................................................. 22
Structure................................................................................................................................. 22
Special Vectors...................................................................................................................... 22
Look-up Table......................................................................................................................... 23
Table Program Example......................................................................................................... 23
In Circuit Programming.......................................................................................................... 24
On-Chip Debug Support ─ OCDS.......................................................................................... 25
RAM Data Memory.......................................................................................... 26
Structure................................................................................................................................. 26
General Purpose Data Memory............................................................................................. 26
Special Purpose Data Memory.............................................................................................. 27
Rev. 1.31
2 April 11, 2017



Holtek Semiconductor HT45F3420
HT45F3420/HT45F3430
Personal Care Flash MCU
Special Function Register Description......................................................... 29
Indirect Addressing Registers – IAR0, IAR1.......................................................................... 29
Memory Pointers – MP0, MP1............................................................................................... 29
Bank Pointer – BP.................................................................................................................. 30
Accumulator – ACC................................................................................................................ 30
Program Counter Low Register – PCL................................................................................... 30
Look-up Table Registers – TBLP, TBLH................................................................................. 31
Status Register – STATUS..................................................................................................... 31
EEPROM Data Memory................................................................................... 33
EEPROM Data Memory Structure......................................................................................... 33
EEPROM Registers............................................................................................................... 33
Reading Data from the EEPROM.......................................................................................... 35
Writing Data to the EEPROM................................................................................................. 35
Write Protection...................................................................................................................... 35
EEPROM Interrupt................................................................................................................. 35
Programming Considerations................................................................................................. 36
Oscillators....................................................................................................... 37
Oscillator Overview................................................................................................................ 37
System Clock Configurations................................................................................................. 37
High Speed Internal RC Oscillator – HIRC............................................................................ 38
Internal 32kHz Oscillator – LIRC............................................................................................ 38
Supplementary Oscillator....................................................................................................... 38
Operating Modes and System Clocks.......................................................... 38
System Clocks....................................................................................................................... 38
System Operating Modes....................................................................................................... 40
Control Registers................................................................................................................... 41
Operating Mode Switching .................................................................................................... 42
Standby Current Considerations............................................................................................ 45
Wake-up................................................................................................................................. 45
Watchdog Timer.............................................................................................. 46
Watchdog Timer Clock Source............................................................................................... 46
Watchdog Timer Control Register.......................................................................................... 46
Watchdog Timer Operation.................................................................................................... 47
Reset and Initialisation................................................................................... 48
Reset Functions..................................................................................................................... 48
Reset Initial Conditions.......................................................................................................... 49
Input/Output Ports.......................................................................................... 54
Pull-high Resistors................................................................................................................. 54
Port A Wake-up...................................................................................................................... 55
I/O Port Control Registers...................................................................................................... 56
Pin-shared Functions............................................................................................................. 57
I/O Port Source Current Control – only for HT45F3430......................................................... 62
I/O Pin Structures................................................................................................................... 63
Programming Considerations ................................................................................................ 64
Rev. 1.31
3 April 11, 2017





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