Holtek HT66F004 User Manual

Rev. 1.71 2 April 11, 2017 Rev. 1.71 3 April 11, 2017
HT66F002/HT66F0025/HT66F003/HT66F004
Cost-Effective A/D Flash MCU with EEPROM
HT66F002/HT66F0025/HT66F003/HT66F004
Cost-Effective A/D Flash MCU with EEPROM
EEPROM Data Memory .................................................................................. 32
EEPROM Data Memory Structure ........................................................................................ 32
EEPROM Registers
.............................................................................................................. 33
Reading Data from the EEPROM
........................................................................................ 34
Writing Data to the EEPROM
................................................................................................ 35
Write Protection
..................................................................................................................... 35
EEPROM Interrupt
................................................................................................................ 35
Programming Considerations
................................................................................................ 36
Oscillator ........................................................................................................ 37
Oscillator Overview ............................................................................................................... 37
System Clock Congurations
................................................................................................ 37
Internal RC Oscillator – HIRC
............................................................................................... 38
Internal 32kHz Oscillator – LIRC
........................................................................................... 38
Supplementary Oscillator
...................................................................................................... 38
Operating Modes and System Clocks ......................................................... 38
System Clocks ...................................................................................................................... 38
System Operation Modes
...................................................................................................... 39
Control Register
.................................................................................................................... 40
Operating Mode Switching
.................................................................................................... 42
NORMAL Mode to SLOW Mode Switching
........................................................................... 43
SLOW Mode to NORMAL Mode Switching
.......................................................................... 44
Entering the SLEEP0 Mode
.................................................................................................. 44
Entering the SLEEP1 Mode
.................................................................................................. 45
Entering the IDLE0 Mode
...................................................................................................... 45
Entering the IDLE1 Mode
...................................................................................................... 45
Standby Current Considerations
........................................................................................... 46
Wake-up
................................................................................................................................ 46
Watchdog Timer ............................................................................................. 47
Watchdog Timer Clock Source .............................................................................................. 47
Watchdog Timer Control Register
......................................................................................... 47
Watchdog Timer Operation
................................................................................................... 48
Reset and Initialisation .................................................................................. 49
Reset Functions .................................................................................................................... 50
Reset Initial Conditions
......................................................................................................... 53
Input/Output Ports ......................................................................................... 56
Pull-high Resistors ................................................................................................................ 57
Port A Wake-up
..................................................................................................................... 58
I/O Port Control Registers
..................................................................................................... 58
Pin-shared Functions
............................................................................................................ 59
I/O Pin Structures
.................................................................................................................. 64
System Clock output pin CLO
............................................................................................... 65
Programming Considerations
................................................................................................ 65

Holtek HT66F004 Specifications

General

Brand	Holtek
Model	HT66F004
Category	Control Unit
Language	English