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HT56RB688 데이터시트(PDF) 62 Page - Holtek Semiconductor Inc |
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HT56RB688 데이터시트(HTML) 62 Page - Holtek Semiconductor Inc |
62 / 164 page 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 conversion 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 device contains an 8-channel analog to digital converter which can directly interface to external analog signals, such as that from sensors or other control signals and convert these signals directly into either a 12-bit digital value. Input Channels Conversion Bits Input Pins 8 12 PA0~PA7 The accompanying block diagram shows the overall internal structure of the A/D converter, together with its associated registers. A/D Converter Data Registers - ADRL, ADRH The device, which has an internal 12-bit A/D converter, requires two data registers, a high byte register, known as ADRH, and a low byte register, known as ADRL. After the conversion process takes place, these registers can be directly read by the microcontroller to obtain the digitised conversion value. Only the high byte register, ADRH, utilises its full 8-bit contents. The low byte register utilises only 4 bit of its 8-bit contents as it contains only the lowest bits of the 12-bit converted value. In the following table, D0~D11 is the A/D conversion data result bits. Register Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 ADRL D3 D2 D1 D0 ¾¾¾¾ ADRH D11 D10 D9 D8 D7 D6 D5 D4 A/D Data Registers Rev. 1.10 62 April 15, 2013 HT56RB688 TinyPowerTM A/D type Smart Card OTP MCU with LCD, DAC, ISO 7816 and USB Interfaces A / D C o n v e r t e r P A 0 / A N 0 P A 1 / A N 1 P A 7 / A N 7 A / D R e f e r e n c e V o l t a g e A D R L A D R H A / D D a t a R e g i s t e r s V B G E N S T A R T E O C B A D O N B V S S P A 7 / A N 7 / V R E F A D C S 2 ~ A D C S 0 f S Y S P C R 7 ~ P C R 0 A C S 4 , A C S 2 ~ A C S 0 1 . 2 5 V A / D C l o c k V D D A D O N B B i t V R E F S B i t ¸ 2 N ( N = 0 ~ 5 ) A/D Converter Structure |
유사한 부품 번호 - HT56RB688_13 |
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