HT48R005 datasheet(3/62 Pages) HOLTEK

3 / 62 page

System Control Registers

- CTRL0, CTRL1.........................................................19

Wake-up Function Register

- PAWK ....................................................................19

Pull-high Registers

- PAPU ..................................................................................19

Oscillator............................................................................................20

System Oscillator Overview..................................................................................20

System Clock Configurations................................................................................20

External Crystal/Resonator Oscillator

- HXT ........................................................20

External RC Oscillator

- ERC...............................................................................20

Internal RC Oscillator

- HIRC...............................................................................21

Internal Low Speed Oscillator

- LIRC...................................................................21

Operating Modes ...............................................................................21

Mode Switching ....................................................................................................21

Standby Current Considerations...........................................................................21

Wake-up...............................................................................................................22

Watchdog Timer ................................................................................23

Watchdog Timer Operation...................................................................................23

Reset and Initialisation .....................................................................24

Reset Functions ...................................................................................................24

Reset Initial Conditions .........................................................................................25

HT48R005............................................................................................................26

HT46R005............................................................................................................27

Input/Output Ports.............................................................................28

Pull-high Resistors................................................................................................28

Port A Wake-up ....................................................................................................28

I/O Port Control Registers.....................................................................................29

Pin-shared Functions............................................................................................29

I/O Pin Structures .................................................................................................29

Programming Considerations ...............................................................................29

Timer/Event Counters .......................................................................31

Configuring the Timer/Event Counter Input Clock Source .....................................31

Timer Registers

- TMR.........................................................................................31

Timer Control Registers

- TMR0C........................................................................31

Timer Mode ..........................................................................................................33

Event Counter Mode.............................................................................................33

Pulse Width Capture Mode...................................................................................33

Prescaler ..............................................................................................................34

PFD Function .......................................................................................................34

I/O Interfacing.......................................................................................................35

Programming Considerations ...............................................................................35

Timer Program Example.......................................................................................36

HT48R005/HT46R005

Rev. 1.00

iii

November 29, 2011

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