HT48R063B datasheet(3/84 Pages) HOLTEK

3 / 84 page

Special Function Registers ..............................................................15

Indirect Addressing Registers

- IAR0, IAR1 .........................................................15

Memory Pointers

- MP0, MP1..............................................................................15

Accumulator

- ACC..............................................................................................17

Program Counter Low Register

- PCL..................................................................17

Status Register

- STATUS ...................................................................................17

Input/Output Ports and Control Registers .............................................................18

System Control Registers

- CTRL0, CTRL1, CTRL2............................................18

Wake-up Function Register

- PAWK ....................................................................20

Pull-high Registers

- PAPU, PBPU, PCPU, PDPU, PEPU, PFPU........................20

Software COM Register

- SCOMC.......................................................................20

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

External 32768Hz Crystal Oscillator

- LXT...........................................................21

LXT Oscillator Low Power Function ......................................................................21

Internal Low Speed Oscillator

- LIRC...................................................................22

Operating Modes ...............................................................................22

Mode Types and Selection ...................................................................................22

Mode Switching ....................................................................................................22

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

Wake-up...............................................................................................................23

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

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

Reset and Initialisation .....................................................................25

Reset Functions ...................................................................................................25

Reset Initial Conditions .........................................................................................26

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

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

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

I/O Port Control Registers.....................................................................................30

Pin-shared Functions............................................................................................30

I/O Pin Structures .................................................................................................30

Programming Considerations ...............................................................................30

Contents

Rev. 1.00

April 7, 2011

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