Справочник Пользователя для IBM PD78083

ADM Rewrite

CS=1, TRG=1

Standby
State

ANIn

INTP3

A /D Conversion

ADCR

INTAD

ANIn

ANIn

ANIn

ANIm

ANIm

ANIn

ANIn

Standby
State

Standby
State

ADM Rewrite

CS=1, TRG=1

ANIm

ANIm

ANIm

 Using the A/D converter input select register (ADIS) and the A/D converter mode register (ADM), select one

channel for the analog input from ANI0 to ANI7 and start A/D conversion.

The following two ways are available to start A/D conversion.

• Hardware start:  Conversion is started by trigger input (INTP3).

• Software start:  Conversion is started by setting ADM.

The A/D conversion result is stored in the A/D conversion result register (ADCR) and the interrupt request signal

(INTAD) is simultaneously generated.

When bit 6 (TRG) and bit 7 (CS) of A/D converter mode register (ADM) are set to 1, the A/D conversion standby

state is set.  When the external trigger signal (INTP3) is input, the A/D conversion starts on the voltage applied

to the analog input pins specified with bits 1 to 3 (ADM1 to ADM3) of ADM.

Upon termination of the A/D conversion, the conversion result is stored in the A/D conversion result register

(ADCR) and the interrupt request signal (INTAD) is generated.  After one A/D conversion operation is started

and terminated, another operation is not started until a new external trigger signal is input.

If data with CS set to 1 is written to ADM again during A/D conversion, the converter suspends its A/D

conversion operation and waits for a new external trigger signal to be input.  When the external trigger input

signal is reinput, A/D conversion is carried out from the beginning.

If data with CS set to 0 is written to ADM during A/D conversion, the A/D conversion operation stops

immediately.

Remarks 1. n  = 0, 1, ... , 7

2. m = 0, 1, ... , 7