RL78/D1A User's Manual: Hardware - Renesas

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Under development Preliminary document Specifications in this document are tentative and subject to change. RL78/D1A CHAPTER 25 SAFETY FUNCTIONS 25.3.8 A/D test function The IEC60730 standard mandates testing the A/D converter. The A/D test function is used to check whether the A/D converter is operating normally by executing A/D conversions of the AVREF voltage. The analog multiplexer can be checked using the following procedure. (1) Perform A/D conversion for the ANIx pin (conversion result 1). (2) Select AVREFM using the ADTES register, perform A/D conversion, and then set the voltage potential difference between the terminals of the sampling capacitor of the A/D converter to 0 V. (3) Perform A/D conversion for the ANIx pin (conversion result 2). (4) Select AVREFP using the ADTES register, perform A/D conversion, and then set the voltage potential difference between the terminals of the sampling capacitor of the A/D converter to AVREF. (5) Perform A/D conversion for the ANIx pin (conversion result 3). (6) Make sure that conversion results 1, 2, and 3 are equal. Using the procedure above can confirm that the analog multiplexer is selected and all wiring is connected. Remarks 1. If the analog input voltage is variable during A/D conversion in steps to above, use another method to check the analog multiplexer. 2. The conversion results might contain an error. Consider an appropriate level of error when comparing the conversion results. ANI0/AVREFP ANI1/AVREFM ANIx ANIx Figure 25-15. Configuration of A/D Test Function VDD VSS A/D convertor + side reference voltage source (AVREF+) - side reference voltage source (AVREF-) R01UH0317EJ0004 Rev. 0.04 1149 Feb. 22, 2013
Under development Preliminary document Specifications in this document are tentative and subject to change. RL78/D1A CHAPTER 25 SAFETY FUNCTIONS (1) A/D test register (ADTES) This register is used to select the A/D converter’s positive reference voltage AVREFP or the A/D converter’s negative reference voltage AVREFM as the target of A/D conversion. When using the A/D test function, specify the following settings: ● Select AVREFM as the target of A/D conversion when converting the internal 0 V. ● Select AVREFP as the target of A/D conversion when converting AVREF. The ADTES register can be set by an 8-bit memory manipulation instruction. Reset signal generation clears this register to 00H. Address: F0013H After reset: 00H R/W Figure 25-16. Format of A/D Test Register (ADTES) Symbol 7 6 5 4 3 2 1 0 ADTES 0 0 0 0 0 ADTES2 ADTES1 ADTES0 ADTES2 ADTES1 ADTES0 A/D conversion target 0 0 0 ANIxx (This is specified using the analog input channel specification register (ADS).) 0 1 0 AVREFM 0 1 1 AVREFP Other than above Setting prohibited R01UH0317EJ0004 Rev. 0.04 1150 Feb. 22, 2013
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User’s Manual 16 RL78/D1A 16-Bit
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NOTES FOR CMOS DEVICES (1) VOLTAGE
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Conventions Data significance: High
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CONTENTS CHAPTER 1 OUTLINE.........
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3.4.4 Short direct addressing .....
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6.8 Operation of Plural Channels of
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