MC80F0224 Datasheet, PDF(74/128 Page) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

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MC80F0224 Datasheet, PDF (74/128 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

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MC80F0208/16/24

Preliminary

(4) AVDD pin input impedance

A series resistor string of approximately 5Kâ¦ is connected be-

tween the AVDD pin and the AVSS pin. Therefore, if the output

impedance of the analog power 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 analog supply volt-

age error.

AVDD

AVSS

ADEN

Resistor Ladder Circuit

8-bit ADC

R60/AN0

R61/AN1

R66/AN6

R67/AN7

MUX

Sample & Hold

Successive

Approximation

Circuit

ADCIF

ADC

INTERRUPT

ADS[4:2]

ADC8

01

10-bit Mode

98

1A0D-CbiRt A(1D0C-Rbit)

ADCRH

ADCRL (8-bit)

10

ADC Result Register

8-bit Mode

98

32

10-bit ADCR

00

ADCRH

ADCRL (8-bit)

10

ADC Result Register

Figure 15-3 A/D Block Diagram

70

MAR. 2005 Ver 0.2

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