P83CE558 datasheet(18/72 Pages) PHILIPS

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Philips Semiconductors

Preliminary specification

P83CE558/P80CE558/P89CE558

Single-chip 8-bit microcontroller

1996 Aug 06

Figure 15. Functional diagram of AD converter.

–

COMPARATOR

SAR

DAC

10–bit result

registers

SCAN LOGIC

ADPSS

ADCON

2 LATCHES

Read

ADRSH

Read

ADRSLn

ANALOG

Mux.

ADC0

ADC7

AVref+

AVref–

AVDD1

AVSS1

ADEXS

INTERNAL BUS

Table 10.

Description of ADCON bits

SYMBOL

BIT

FUNCTION

ADCON.7

ADPR1

Control bit for the prescaler.

ADCON.6

ADPR0

Control bit for the prescaler.

ADPR1=0 ADPR0=0 Prescaler divides by 2 (default by reset)

ADPR1=0 ADPR0=1 Prescaler divides by 4

ADPR1=1 ADPR0=0 Prescaler divides by 6

ADPR1=1 ADPR0=1 Prescaler divides by 8

ADCON.5

ADPOS

ADPOS is reserved for future use. Must be ’0’ if ADCON is written.

ADCON.4

ADINT

ADC interrupt flag. This flag is set when all selected analog inputs are converted, as well in continuous

scan as in one-time scan mode. An interrupt is invoked if this interrupt is enabled. ADINT must be cleared

by software. It cannot be set by software.

ADCON.3

ADSST

ADC start and status. Setting this bit by software or by hardware (via ADEXS input) starts the A/D

conversion of the selected analog inputs. ADSST stays a ‘one’ in continuous scan mode. In one-time scan

mode, ADSST is cleared by hardware when the last selected analog input channel has been converted. As

long as ADSST is ’1’, new start commands to the ADC-block are ignored.

An A/D conversion in progress is aborted if ADSST is cleared by software.

ADCON.2

ADCSA

Continuous scan of the selected analog inputs after a start of an A/D conversion.

One-time scan of the selected analog inputs after a start of an A/D conversion.

ADCON.1

ADSRE

A rising edge at input ADEXS will start the A/D conversion and generate a capture signal.

A rising edge at input ADEXS has no effect.

ADCON.0

ADSFE

A falling edge at input ADEXS will start the A/D conversion and generate a capture signal.

A falling edge at input ADEXS has no effect.

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