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HT66F20 Datasheet(PDF) 131 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 131 Page - Holtek Semiconductor Inc |
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131 / 250 page  HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Rev. 1.20 131 June 4, 2010 Analog to Digital Converter The need to interface to real world analog signals is a common requirement for many electronic systems. However, to properly process these signals by a microcontroller, they must first be converted into digital signals by A/D converters. By integrating the A/D con- version electronic circuitry into the microcontroller, the need for external components is reduced significantly with the corresponding follow-on benefits of lower costs and reduced component space requirements. A/D Overview The devices contains a multi-channel analog to digital converter which can directly interface to external analog signals, such as that from sensors or other control sig- nals and convert these signals directly into either a 12-bit digital value. Part No. Input Channels A/D Channel Select Bits Input Pins HT66F20 HT66F30 HT66F40 HT66F50 8 ACS4, ACS2~ACS0 AN0~AN7 HT66F60 12 ACS4, ACS3~ACS0 AN0~AN11 The accompanying block diagram shows the overall in- ternal structure of the A/D converter, together with its as- sociated registers. A/D Converter Register Description Overall operation of the A/D converter is controlled us- ing six registers. A read only register pair exists to store the ADC data 12-bit value. The remaining three or four registers are control registers which setup the operating and control function of the A/D converter. Register Name Bit 76543210 ADRL(ADRFS=0) D3 D2 D1 D0 ¾¾¾¾ ADRL(ADRFS=1) D7 D6 D5 D4 D3 D2 D1 D0 ADRH(ADRFS=0) D11 D10 D9 D8 D7 D6 D5 D4 ADRH(ADRFS=1) ¾¾¾¾ D11 D10 D9 D8 ADCR0 START EOCB ADOFF ADRFS ¾ ACS2 ACS1 ACS0 ADCR1 ACS4 V125EN ¾ VREFS ¾ ADCK2 ADCK1 ADCK0 ACERL ACE7 ACE6 ACE5 ACE4 ACE3 ACE2 ACE1 ACE0 HT66F20/HT66F30/HT66F40/HT66F50 A/D Converter Register List Register Name Bit 76543210 ADRL(ADRFS=0) D3 D2 D1 D0 ¾¾¾¾ ADRL(ADRFS=1) D7 D6 D5 D4 D3 D2 D1 D0 ADRH(ADRFS=0) D11 D10 D9 D8 D7 D6 D5 D4 ADRH(ADRFS=1) ¾¾¾¾ D11 D10 D9 D8 ADCR0 START EOCB ADOFF ADRFS ACS3 ACS2 ACS1 ACS0 ADCR1 ACS4 V125EN ¾ VREFS ¾ ADCK2 ADCK1 ADCK0 ACERL ACE7 ACE6 ACE5 ACE4 ACE3 ACE2 ACE1 ACE0 ACERH ¾¾¾¾ ACE11 ACE10 ACE9 ACE8 HT66F60 A/D Converter Register List |
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