T89C5115-RATIM datasheet(79/105 Pages) ATMEL

79 / 105 page

T89C5115

4128A–8051–04/02

Figure 36. ADC Description

Figure 37 shows the timing diagram of a complete conversion. For simplicity, the figure

depicts the waveforms in idealized form and do not provide precise timing information.

For ADC characteristics and timing parameters refer to the Section “AC Characteristics”

of the T89C5115 datasheet.

Figure 37. Timing Diagram

Note:

Tsetup min = 4 us

Tconv=11 clock ADC = 1sample and hold + 10 bit conversion

The user must ensure that 4 us minimum time between setting ADEN and the start of the first conversion.

ADC Converter

Operation

A start of single A/D conversion is triggered by setting bit ADSST (ADCON.3).

After completion of the A/D conversion, the ADSST bit is cleared by hardware.

The end-of-conversion flag ADEOC (ADCON.4) is set when the value of conversion is

available in ADDH and ADDL, it must be cleared by software. If the bit EADC (IEN1.1) is

set, an interrupt occur when flag ADEOC is set (see Figure 39). Clear this flag for re-

arming the interrupt.

The bits SCH0to SCH2inADCON register areused for theanaloginput channel

selection.

AN0/P1.0

AN1/P1.1

AN2/P1.2

AN3/P1.3

AN4/P1.4

AN5/P1.5

AN6/P1.6

AN7/P1.7

000

001

010

011

100

101

110

111

SCH2

ADCON.2

SCH0

ADCON.0

SCH1

ADCON.1

ADC

CLOCK

ADEN

ADCON.5

ADSST

ADCON.3

ADEOC

ADCON.4

ADC

Interrupt

Request

EADC

IEN1.1

CONTROL

AVSS

Sample and Hold

ADDH

VAREF

R/2R DAC

VAGND

ADDL

SAR

ADCIN

ADEN

ADSST

ADEOC

TSETUP

TCONV

CLK

T89C5115-RATIM Datasheet(PDF) 79 Page - ATMEL Corporation

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