Z8F082ASH020SC datasheet(135/244 Pages) ZILOG

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PS024705-0405

P R E L I M I N A R Y

Analog-to-Digital Converter

Z8 Encore! XP® F08xA Series

Product Specification

117

ADC Control Register Definitions

ADC Control Register 0

The ADC Control register selects the analog input channel and initiates the analog-to-dig-

ital conversion.

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.

REFSELL—Voltage Reference Level Select Low Bit; in conjunction with the High bit

(REFSELH) in ADC Control/Status Register 1, this determines the level of the internal volt-

age reference; the following details the effects of {REFSELH, 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

REFEXT - External Reference Select

0 = External reference buffer is disabled; Vref pin is available for GPIO functions

1 = The internal ADC reference is buffered and connected to the Vref pin

CONT

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

clock cycles

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

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® F08xA Series. Refer to the chapter “Pin Descrip-

tion” on page 7

for information regarding the Port pins available with each package style.

Do not enable unavailable analog inputs. Usage of these bits changes depending on the

buffer mode selected in ADC Control/Status Register 1.

Table 70. ADC Control Register 0 (ADCCTL0)

BITS

FIELD

CEN

REFSELL

REFEXT

CONT

ANAIN[3:0]

RESET

000

R/W

R/WR/W

ADDR

F70H

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