ZUSBOPTSC01ZACG datasheet(151/282 Pages) ZILOG

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PS022827-1212

P R E L I M I N A R Y

ADC Control Register Definitions

Z8 Encore! XP® F082A Series

Product Specification

134

ADC Control Register 0

The ADC Control Register 0 (ADCCTL0) selects the analog input channel and initiates

the analog-to-digital conversion. It also selects the voltage reference configuration.

Table 73. ADC Control Register 0 (ADCCTL0)

Bit

Field

CEN

REFSELL

REFOUT

CONT

ANAIN[3:0]

RESET

00000000

R/W

R/WR/W

R/WR/WR/WR/WR/WR/W

Address

F70H

Bit

Description

[7]



CEN

Conversion Enable

0 = Conversion is complete. Writing a 0 produces no effect. The ADC automatically clears

this bit to 0 when a conversion is complete.

1 = Begin conversion. Writing a 1 to this bit starts a conversion. If a conversion is already in

progress, the conversion restarts. This bit remains 1 until the conversion is complete.

[6]



REFSELL

Voltage Reference Level Select Low Bit

In conjunction with the High bit (REFSELH) in ADC Control/Status Register 1, this deter-

mines the level of the internal voltage reference; the following details the effects of {REF-

SELH, REFSELL}; note that this reference is independent of the Comparator reference.

00 = Internal Reference Disabled, reference comes from external pin.



01 = Internal Reference set to 1.0 V.



10 = Internal Reference set to 2.0 V (default).



11 = Reserved.

[5]



REFOUT

Internal Reference Output Enable

0 = Reference buffer is disabled; Vref pin is available for GPIO or analog functions.

1 = The internal ADC reference is buffered and driven out to the VREF pin.

Caution: When the ADC is used with an external reference ({REFSELH,REFSELL}=00),

the REFOUT bit must be set to 0.

[4]



CONT

Conversion

0 = Single-shot conversion. ADC data is output once at completion of the 5129 system clock

cycles (measurements of the internal temperature sensor take twice as long).

1 = Continuous conversion. ADC data updated every 256 system clock cycles after an initial

5129 clock conversion (measurements of the internal temperature sensor take twice as

long).

[3:0]



ANAIN[3:0]

Analog Input Select

These bits select the analog input for conversion. Not all Port pins in this list are available in

all packages for the Z8 Encore! XP F082A Series. For information about port pins available

with each package style, see the Pin Description chapter on page 8. Do not enable unavail-

able analog inputs. Usage of these bits changes depending on the buffer mode selected in

ADC Control/Status Register 1.

ZUSBOPTSC01ZACG 数据表(PDF) 151 Page - Zilog, Inc.

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