T89C5115-RATIM datasheet(84/113 Pages) ATMEL

84 / 113 page

AT89C5115

4128F–8051–05/06

Figure 38. ADC Description

Figure 39 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 this datasheet.

Figure 39. Timing Diagram

Note:

Tsetup min, see the AC Parameter for A/D conversion.

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

The user must ensure that Tsetup 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 41). Clear this flag for re-

arming the interrupt.

Note:

Always leave Tsetup time before starting a conversion unless ADEN is permanently high.

In this case one should wait Tsetup only before the first conversion

Rai

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

Cai

ADEN

ADSST

ADEOC

TSETUP

TCONV

CLK

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