GMS87C2020 datasheet(65/92 Pages) HYNIX

Part #	GMS87C2020

Description	CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver

PDF	92 Pages

Scroll/Zoom	100%

Manufacturer	HYNIX [Hynix Semiconductor]

Direct Link	http://www.skhynix.com/kor/main.do

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65 / 92 page

Hyundai Micro Electronics

GMS81C2020/GMS81C2120

Nov. 1999 Ver 0.0

preliminary

(3) Pins AN11/R73 to AN8/R70 and AN7/R67 to AN0/

R60

The analog input pins AN11 to AN0 also function as input/

output port (PORT R7 and R6) pins. When A/D conver-

sion is performed with any of pins AN11 to AN0 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) AVDD pin input impedance

A series resistor string of approximately 10K

Ω is connected be-

tween the AVDD pin and the AVSS 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 AVDD pin and the AVSS pin,

and there will be a large reference voltage error.

GMS87C2020 Datasheet(PDF) 65 Page - Hynix Semiconductor