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HT67F86A Internal RTC Application Guidelines 

 

AN0448E  V1.00 

7/7 

January 16, 2017 

Version and Modification Information 

Date 

Author 

Issue 

2016.12.20 

黃啟德

 

First Version 

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Summary of Contents for HT67F86A

Page 1: ...orms an excellent solution for applications which require a real time clock function as it reduces the need for an external timing IC with the resulting reductions in cost and design simplification This application note will introduce the Holtek MCU internal RTC oscillator characteristics and application guidelines Functional Description Oscillators The HT67F86A provides 3 frequency oscillation so...

Page 2: ...h enable the LXT oscillator By examining if the LXTF bit has been set high it can be determined if the LXT oscillator is powered up and ready for use The LXT oscillator circuit is shown as below Note 1 RP C1 and C2 are required 2 Although not shown pins have a parasitic capacitance of around 7pF To internal circuits Internal Oscillator Circuit C1 C2 XT1 XT2 RP 32 768kHz Internal RC Oscillator Exte...

Page 3: ... TB1 2 0 Time Base 0 Interrupt Time Base 1 Interrupt TB0ON TB1ON Prescaler 1 fPSC 28 fPSC 215 Time Base Interrupt TB0C Register Bit 7 6 5 4 3 2 1 0 Name TB0ON TB02 TB01 TB00 R W R W R W R W R W POR 0 0 0 0 Bit 7 TB0ON Time Base 0 Enable Control 0 Disable 1 Enable Bit 6 3 Unimplemented read as 0 Bit 2 0 TB02 TB00 Time Base 0 time out period selection 000 28 fPSC 001 29 fPSC 010 210 fPSC 011 211 fPS...

Page 4: ...aracteristics Operating Voltage The internal RTC operating voltage depends on the LXT oscillator which has a voltage range of 2 2V 5 5V Such applications are suitable for battery powered products which require 2 3 batteries Refer to the Low Speed Crystal Oscillator Characteristics LXT section in the datasheet or the following table for the related voltage characteristics Ta 25 C Symbol Parameter T...

Page 5: ...oscillating state together and the Time Base clock circuit turned on to reduce power it can provides a low MCU standby power consumption of lower than 1µA at an operating voltage of 3V thus achieve longer service life for battery powered products This means that the HT67F86A forms an excellent choice for power sensitive applications As well as considerations regarding the frequency characteristics...

Page 6: ...llent choice for these applications due to its low power consumption and 1024 pixel LCD driver Consumer Products The HT67F86A internal Real Time Clock function can be applied for use in a wide range of battery powered consumer products such as electronic alarm clocks etc Conclusion This application note summarises the internal RTC usage considerations providing reference information for designers ...

Page 7: ...sing in using or in connection with the use of this website by any party There may be links in this area which allow you to visit the websites of other companies These websites are not controlled by Holtek Holtek will bear no responsibility and no guarantee to whatsoever Information displayed at such sites Hyperlinks to other websites are at your own risk Limitation of Liability In no event shall ...

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