GMS87C1102 datasheet(59/89 Pages) HYNIX

tên linh kiện	GMS87C1102

Giải thích chi tiết về linh kiện	8-BIT SINGLE-CHIP MICROCONTROLLERS

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GMS81C1102 / GMS81C1202

Jan. 2002 ver 2.0

(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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