Name: Holtek HT66F30
Brand: Holtek
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A/D Flash MCU with EEPROM

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Revision: V2.50 Date: June 22, 2017June 22, 2017

Table of Contents2
Features7
Peripheral Feat�Res8
General Description9
Selection Table10
Block Diagram11
Pin Assignment12
Pin Description16
Absolute Maximum Ratings22
D.C. Characteristics23
A/D Converter Characteristics25
Comparator Electrical Characteristics26
Power-On Reset Characteristics26
System Architecture27
Clocking and Pipelining27
Stack29
Arithmetic and Logic Unit - ALU29
Flash Program Memory30
Special Vectors31
Look-�P Table31
In Circ�It Programming - ICP33
Data Memory34
Special Function Register Description38
Indirect Addressing Registers - IAR0� IAR38
Memory Pointers - MP0� MP38
Bank Pointer - BP39
EEPROM Data Memory44
EEPROM Data Memory Str�Ct�Re44
EEPROM Registers44
Reading Data from the EEPROM48
Writing Data to the EEPROM48
Write Protection48
EEPROM Interr�Pt48
Programming Considerations49
Programming Examples49
Oscillators50
Oscillator Overview50
System Clock Configurations50
External Crystal/Ceramic Oscillator - HXT52
External RC Oscillator - ERC53
Internal High Speed RC Oscillator - HIRC53
External 32.�68Khz Crystal Oscillator - LXT54
Internal Low Speed Oscillator - LIRC55
S�Pplementary Oscillators55
Operating Modes and System Clocks56
System Clock56
System Operation Modes58
Control Register59
Fast Wake-�P61
Operating Mode Switching62
Standby C�Rrent Considerations66
Programming Considerations67
Watchdog Timer68
Watchdog Timer Clock So�Rce68
Watchdog Timer Control Register68
Watchdog Timer Operation69
Reset and Initialisation70
Reset F�Nctions70
Reset Initial Conditions73
Input/Output Ports83
P�Ll-High Resistors86
Port a Wake-�P88
I/O Port Control Registers88
Pin-Remapping F�Nctions91
Pin-Remapping Registers91
Timer Modules - TM99
Introd�Ction99
TM Operation100
TM Clock So�Rce100
TM Interr�Pts100
TM External Pins101
Programming Considerations111
Compact Type TM - CTM112
Compact TM Operation112
Compact Type TM Register Description113
Compact Type TM Operating Modes117
Standard Type TM - STM123
Standard TM Operation123
Standard Type TM Register Description124
Standard Type TM Operating Modes133
Enhanced Type TM - ETM144
Enhanced TM Operation145
Enhanced Type TM Register Description145
Enhanced Type TM Operating Modes152
Aanlog to Digital Converter169
A/D Overview169
A/D Converter Register Description169
A/D Operation175
Programming Considerations178
A/D Programming Example179
Comparators181
Comparator Operation181
Comparator Registers182
Comparator Interr184
Programming Considerations184
Serial Interface Module - SIM185
SPI Interface185
I 2 C Interface192
Peripheral Clock Output201
Peripheral Clock Operation201
Interrupts202
Interr�Pt Operation216
M�Lti-F�Nction Interr�Pt217
Programming Considerations225
Low Voltage Detector - LVD226
LVD Register226
LVD Operation227
SCOM Function for LCD228
LCD Operation228
LCD Bias Control229
Configuration Options231
Application Circuits232
UART Module Serial Interface233
Pin Assignment234
UART Data Transfer Scheme240
UART Commands241
Ba�D Rate Generator241
Managing Receiver Errors254
Instruction Set259
Moving and Transferring Data259
Arithmetic Operations259
Logical and Rotate Operation260
Branches and Control Transfer260
Bit Operations260
Other Operations260
Instruction Set Summary261
Instruction Definition263
Package Information272
6-Pin DIP (300Mil) O�Tline Dimensions273
6-Pin NSOP (�50Mil) O�Tline Dimensions275

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User Guide20 pages

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Holtek HT66F30 Specifications

General

Brand	Holtek
Model	HT66F30
Category	Computer Hardware
Language	English

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