HT56RB27 datasheet(5/153 Pages) HOLTEK

5 / 153 page

Reset and Initialisation .....................................................................88

Reset Functions ...................................................................................................88

Reset Initial Conditions .........................................................................................90

Oscillator............................................................................................94

System Clock Configurations................................................................................94

External Crystal/ Ceramic Oscillator

- HXT .........................................................94

External RC Oscillator

- ERC...............................................................................95

Internal RC Oscillator

- HIRC...............................................................................95

Internal 32kHz RC Oscillator

- LIRC.....................................................................95

External 32.768kHz Oscillator

- LXT ....................................................................96

LXT Oscillator Low Power Function ......................................................................97

External Oscillator

- EC........................................................................................97

System Operating Modes .................................................................97

Clock Sources ......................................................................................................97

.............................................................................................................................99

Operating Modes................................................................................................100

Power Down Mode and Wake-up ...................................................101

Power Down Mode .............................................................................................101

Entering the Power Down Mode .........................................................................101

Standby Current Considerations.........................................................................101

Wake-up .............................................................................................................101

Low Voltage Detector

- LVD...........................................................102

LVD Operation....................................................................................................102

Watchdog Timer ..............................................................................103

Watchdog Timer Operation.................................................................................103

Clearing the Watchdog Timer .............................................................................104

USB Interface...................................................................................105

USB Operation ...................................................................................................105

USB Status and Control Registers......................................................................105

USB Register Summary .....................................................................................106

USB Interface Suspend Mode and Wake-up.......................................................114

USB Interrupt Structure......................................................................................115

Digital to Analog Converter

- DAC ................................................116

Operation............................................................................................................116

DC/DC Converter and LDO .............................................................117

DC2DC Register.................................................................................................117

Contents

Rev. 1.20

April 26, 2013

HT56RB27 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc

HT56RB27 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc

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