GMS87C2020 datasheet(64/92 Pages) HYNIX

64 / 92 page

GMS81C2020/GMS81C2120

Hyundai Micro Electro nics

preliminary

Nov. 1999 Ver 0.0

Figure 18-2 A/D Converter Registers

Figure 18-3 A/D Converter Operation Flow

A/D Converter Cautions

(1) Input range of AN11 to AN0

The input voltages of AN11 to AN0 should be within the

specification range. In particular, if a voltage above AVDD

or below AVSS is input (even if within the absolute maximum

rating range), the conversion value for that channel can not be in-

determinate. The conversion values of the other channels may

also be affected.

(2) Noise countermeasures

In order to maintain 8-bit resolution, attention must be paid to

noise on pins AVDD and AN11 to AN0. Since

the effect in-

creases in proportion to the output impedance of the analog

input source, it is recommended that a capacitor be connected

externally as shown in Figure 18-4 in order to reduce noise.

Figure 18-4 Analog Input Pin Connecting Capacitor

ADCM

ADDRESS : EAH

RESET VALUE : -0000001

ADEN

ADS3

ADS2

ADS1

ADS0

ADST

ADSF

Reserved

Analog Channel Select

A/D Status bit

0 : A/D Conversion is in process

1 : A/D Conversion is completed

A/D Start bit

1 : A/D Conversion is started

After 1 cycle, cleared to "0"

0 : Bit force to zero

0000 : Channel 0 ( R60/AN0 )

0001 : Channel 1 ( R61/AN1 )

0010 : Channel 2 ( R62/AN2 )

0011 : Channel 3 ( R63/AN3)

0100 : Channel 4 ( R64/AN4 )

0101 : Channel 5 ( R65/AN5 )

0110 : Channel 6 ( R66/AN6 )

0111 : Channel 7 ( R67/AN7 )

A/D Enable bit

1 : A/D Conversion is enable

0 : A/D Converter module shut off

and consumes no operation current

A/D Control Register

ADCR

ADDRESS : EBH

RESET VALUE : Undefined

ADCR7

ADCR6

ADCR5

ADCR4

ADCR3

ADCR2

ADCR1

ADCR0

A/D Result Data Register

1000 : Channel 8 ( R64/AN8 )

1001 : Channel 9 ( R65/AN9 )

1010 : Channel 10 ( R66/AN10 )

1011 : Channel 11 ( R67/AN11 )

ENABLE A/D CONVERTER

A/D START ( ADST = 1 )

NOP

ADSF = 1

A/D INPUT CHANNEL SELECT

ANALOG REFERENCE SELECT

READ ADCR

YES

AN11~AN0

100~1000pF

Analog

Input

GMS87C2020 Datasheet(PDF) 64 Page - Hynix Semiconductor

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