P80C562 查看數據表（PDF） - Philips Electronics

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P80C562

8-bit microcontroller

Philips Electronics 

Philips Semiconductors

8-bit microcontroller

Product specification

P83C562; P80C562

11 ANALOG-TO-DIGITAL CONVERTER (ADC)

The completion of the 8-bit ADC conversion is flagged by

ADCI in the ADCON register and the result is stored in

Special Function Register ADCH.

An ADC conversion in progress is unaffected by an

external or software ADC start. The result of a completed

conversion remains unaffected provided ADCI = 1. While

ADCS = 1 or ADCI = 1, a new ADC start will be blocked

and consequently lost.

An ADC conversion already in progress is aborted when

the Idle or Power-down mode is entered. The result of a

completed conversion (ADCI = 1) remains unaffected

when entering the Idle mode.

If ADCI is cleared by software and ADCS is set at the same

time, a new analog-to-digital conversion with the same

channel number, may be started. However, it is

recommended to reset ADCI before ADCS is set.

11.1 Analog input pins

The analog input circuitry consists of an 8-input analog

multiplexer and an ADC with 8-bit resolution. The analog

reference voltage and analog power supplies are

connected via separate input pins. The conversion takes

24 machine cycles i.e. 18 µs at an oscillator frequency of

16 MHz.

The ADC is controlled using the ADC Control Register

(ADCON). Input channels are selected by the analog

multiplexer, using bits AADR.0 to AADR.2 in ADCON.

handbook, full pagewidth

ADC0

ADC1

ADC2

ADC3

ADC4

ADC5

ADC6

ADC7

ANALOG INPUT

MULTIPLEXER

8-BIT ADC

STADC

analog reference

supply (analog part)

ground (analog part)

ADCON 0 1 2 3 4 5 6 7

0 1 2 3 4 5 6 7 ADCH

INTERNAL BUS

MBH350

Fig.9 Functional diagram of analog input.

1997 Apr 08

16

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