HT48R002 datasheet(3/71 Pages) HOLTEK

3 / 71 page

Rev. 1.11

April 11, 2017

Rev. 1.11

April 11, 2017

HT48R002/HT48R003

Cost-Effective I/O 8-Bit OTP MCU

HT48R002/HT48R003

Cost-Effective I/O 8-Bit OTP MCU

Power Down Mode and Wake-up.................................................................. 23

Power Down Mode................................................................................................................ 23

Entering the Power Down Mode ........................................................................................... 23

Standby Current Considerations........................................................................................... 23

Wake-up................................................................................................................................ 24

Watchdog Timer............................................................................................. 25

Watchdog Timer Clock Source.............................................................................................. 25

Watchdog Timer Control Registers ....................................................................................... 25

Watchdog Timer Operation ................................................................................................... 26

Reset and Initialization.................................................................................. 27

Reset Functions .................................................................................................................... 27

Reset Initial Conditions ......................................................................................................... 30

Input/Output Ports......................................................................................... 33

I/O Register List .................................................................................................................... 33

Pull-high Resistors ................................................................................................................ 34

Port A Wake-up ..................................................................................................................... 34

I/O Port Control Registers..................................................................................................... 35

Pin-shared Functions ............................................................................................................ 36

I/O Pin Structures.................................................................................................................. 36

Programming Considerations................................................................................................ 37

Timer/Event Counter ..................................................................................... 38

Configuring the Timer/Event Counter Input Clock Source .................................................... 38

Timer Register – TMR0......................................................................................................... 39

Timer Control Register – TMR0C.......................................................................................... 39

Timer Mode ........................................................................................................................... 40

Event Counter Mode ............................................................................................................. 41

Pulse Width Capture Mode ................................................................................................... 42

Prescaler............................................................................................................................... 43

PFD Function (for HT48R003) .............................................................................................. 43

I/O Interfacing........................................................................................................................ 43

Programming Considerations................................................................................................ 44

Timer Program Example ....................................................................................................... 45

Interrupts........................................................................................................ 46

Interrupt Register .................................................................................................................. 46

Interrupt Operation................................................................................................................ 47

Interrupt Priority..................................................................................................................... 48

External Interrupt................................................................................................................... 49

Timer/Event Counter Interrupt............................................................................................... 49

Interrupt Wake-up Function................................................................................................... 49

Programming Considerations................................................................................................ 50

Application Circuits....................................................................................... 50

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