MB91155 datasheet(55/105 Pages) FUJITSU

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MB91F155A/MB91155/MB91154

8/10-bit A/D Converter (Sequential Conversion Type)

The A/D converter is a module that converts analog input voltage into a digital value. Its features are as follows :

• A minimum conversion time of 5.0

µs/ch. (Including sampling time at a 33 MHz machine clock)

• Contains a sample and hold circuit.

• Resolution : 10 or 8 bits selectable.

• Selection of analog input from eight channels by program

• DMA transfer can be invoked by interrupt.

• Selection of an invoking factor from software, external pin trigger (falling edge) , and 16-bit reload timer (rising

edge) .

• Block Diagram

Single conversion mode :

Selects and converts one channel.

Continuous conversion mode : Converts a specified channel repeatedly.

Stop and convert mode :

Stops after converting one channel and stands by until invoked the next time.

(Conversion invoking can be synchronized.)

Comparator

Data register

A/D control register 1

A/D control register 2

Sample & hold circuit

AN0

AN1

AN2

AN3

AN4

AN5

AN6

AN7

ADCR

D/A converter

Sequential compare

Input

circuit

ADCS1

, 2

Operating clock

Prescaler

16-bit reload timer 2

External pin trigger

AVSS AVR

± AVSS

MB91155 Datasheet(PDF) 55 Page - fujitsu semiconductor

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