HT56RB688_13 datasheet(5/164 Pages) HOLTEK

5 / 164 page

Real Time Clock Interrupt .....................................................................................97

Time Base Interrupt ..............................................................................................98

Programming Considerations ...............................................................................99

Reset and Initialisation ...................................................................100

Reset Functions .................................................................................................100

Reset Initial Conditions .......................................................................................102

Oscillator..........................................................................................106

System Clock Configurations..............................................................................106

External Crystal/ Ceramic Oscillator

- HXT .......................................................106

External RC Oscillator

- ERC.............................................................................107

Internal RC Oscillator

- HIRC .............................................................................107

Internal 32kHz RC Oscillator

- LIRC...................................................................107

External 32.768kHz Oscillator

- LXT ..................................................................108

LXT Oscillator Low Power Function ....................................................................109

External Oscillator

- EC......................................................................................109

System Operating Modes ...............................................................109

Clock Sources ....................................................................................................109

Operating Modes ................................................................................................112

Power Down Mode and Wake-up ...................................................113

Power Down Mode .............................................................................................113

Entering the Power Down Mode .........................................................................113

Standby Current Considerations .........................................................................113

Wake-up .............................................................................................................113

Low Voltage Detector - LVD ...........................................................114

LVD Operation ....................................................................................................114

Watchdog Timer...............................................................................115

Watchdog Timer Operation .................................................................................115

Clearing the Watchdog Timer..............................................................................116

USB Interface ...................................................................................117

USB Operation ...................................................................................................117

USB Status and Control Registers ......................................................................117

USB Register Summary......................................................................................118

USB Interface Suspend Mode and Wake-up ......................................................126

USB Interrupt Structure .....................................................................................127

Digital to Analog Converter - DAC ................................................128

Operation ...........................................................................................................128

DC/DC Converter and LDO .............................................................129

DC2DC Register.................................................................................................129

Contents

Rev. 1.10

April 15, 2013

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