HT85F2270 datasheet(6/226 Pages) HOLTEK

6 / 226 page

Rev. 1.00

6 of ��6

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

30 Analog to Digital Converter – ADC ................................................................. 153

A/D Overview .................................................................................................................. 1��

A/D Converter Register Description ................................................................................ 1�4

A/D Converter Data Registers – ADRL� ADRH ............................................................... 1�4

A/D Converter Control Registers – ADCR0� ADCR1� ADCR�� ADPGA .......................... 1�4

A/D Operation.................................................................................................................. 1�8

A/D Converter Clock Source ........................................................................................... 1�9

A/D Input Pins ................................................................................................................. 1�9

Temperature Sensor........................................................................................................ 160

A/D Reference Voltage Source ....................................................................................... 160

Summar� of A/D Conversion Steps................................................................................. 161

A/D Conversion Timing.................................................................................................... 16�

Programming Considerations.......................................................................................... 16�

A/D Transfer Function ..................................................................................................... 16�

31 Digital to Analog Converter – DAC.................................................................. 164

DAC Register Description ............................................................................................... 164

DAC Operation................................................................................................................ 166

DAC Reference Voltage Source...................................................................................... 167

Programming Considerations.......................................................................................... 167

32 Voltage Reference Generator .......................................................................... 168

Voltage Reference Generator Operation......................................................................... 168

33 Comparators ..................................................................................................... 170

Comparator Operation..................................................................................................... 170

Comparator Registers ..................................................................................................... 171

Comparator Interrupt....................................................................................................... 176

Comparator Reset Function ............................................................................................ 176

Programming Considerations.......................................................................................... 176

34 I2C Serial Interface ............................................................................................ 177

I�C Interface Operation.................................................................................................... 177

I�C Registers ................................................................................................................... 178

I�C Bus Communication .................................................................................................. 18�

I�C Bus Start Signal.................................................................................................................... 18�

Slave Address............................................................................................................................. 18�

I�C Bus Read/Write Signal.......................................................................................................... 18�

I�C Bus Slave Address Acknowledge Signal .............................................................................. 18�

I�C Bus Data and Acknowledge Signal....................................................................................... 184

I�C Status Codes ........................................................................................................................ 18�

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