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GMS87C1102 Datasheet(PDF) 52 Page - Hynix Semiconductor |
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GMS87C1102 Datasheet(HTML) 52 Page - Hynix Semiconductor |
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52 / 80 page  GMS87C1102 / GMS87C1202 HYUNDAI MicroElectronics 52 Oct. 1999 ver 1.0 (3) Pins AN0/RB0 and AN1/RA1 to AN7/RA7 The analog input pins AN0 to AN7 also function as input/ output port (PORT RA and RB0) pins. When A/D conver- sion is performed with any of pins AN0 to AN7 selected, be sure not to execute a PORT input instruction while con- version is in progress, as this may reduce the conversion resolution. Also, if digital pulses are applied to a pin adjacent to the pin in the process of A/D conversion, the expected A/D conversion value may not be obtainable due to coupling noise. Therefore, avoid applying pulses to pins adjacent to the pin undergoing A/D conversion. (4) AVREF pin input impedance A series resistor string of approximately 10K Ω is connected be- tween the AVREFpin and the VSS pin. Therefore, if the output impedance of the reference voltage source is high, this will result in parallel connection to the series resistor string between the AVREF pin and the VSS pin, and there will be a large reference voltage error. |
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