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HT85F2270 Datasheet(PDF) 167 Page - Holtek Semiconductor Inc |
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HT85F2270 Datasheet(HTML) 167 Page - Holtek Semiconductor Inc |
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167 / 226 page  Rev. 1.00 167 of ��6 �a� 1�� �01� Standard 8051 8-Bit Flash MCU HT85F2260/HT85F2270/HT85F2280 DAC Reference Voltage Source The DAC can obtain its reference voltage from three different sources, the VCCA2 power supply pin, an externally supplied reference voltage supplied on pin VREF or from the internal voltage reference generator. Two bits control which reference source is selected, these are the VREFIS and VREFDS bits. DAC Converter Voltage Reference Select VREFIS VREFDS Reference Source 0 0 VCCA� pin 0 1 Externall� supplied on VREF pin 1 0 VCCA� pin 1 1 Internal Voltage Reference Generator Programming Considerations Note that data written to the two DAC registers must be implemented in a specific way. Any data written into the DAH register will load both the data into the DAL and DAH registers simultaneously and influence the DAC output at the same time. However writing data to the DAL register will only place the data into a low byte buffer and not directly into the DAL register. For this reason, writing data to the DAL register should be followed by a write instruction to the DAH register. |
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