HT85F2270 datasheet(155/226 Pages) HOLTEK

155 / 226 page

Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

ADCR0 Register

SFR Address: F1h

Bit

Name

START

EOCB

ADOFF

ADRFS

ACS�

ACS1

ACS0

R/W

POR

Bit 7

START: Starts the A/D conversion

0→1→0: Start

0→1: Reset the A/D converter and set EOCB to “1”

This bit is used to initiate an A/D conversion process. The bit is normally low but if set

high and then cleared low again, the A/D converter will initiate a conversion process.

When the bit is set high the A/D converter will be reset.

Bit 6

EOCB: End of A/D conversion flag

0: A/D conversion ended

1: A/D conversion in progress

This read only flag is used to indicate when an A/D conversion process has completed.

When the conversion process is running the bit will be high.

Bit 5

ADOFF : ADC power on/off control bit

0: ADC power on

1: ADC power off

This bit controls the power to the A/D internal function. This bit should be cleared

to zero to enable the A/D converter. If the bit is set high then the A/D converter will

be switched off reducing the device power consumption. As the A/D converter will

consume a limited amount of power, even when not executing a conversion, this may be

an important consideration in power sensitive battery powered applications.

Bit 4

ADRFS: ADC Data Format Control

0: ADC Data MSB is ADRH bit 7, LSB is ADRL bit 4

1: ADC Data MSB is ADRH bit 3, LSB is ADRL bit 0

This bit controls the format of the 12-bit converted A/D value in the two A/D data

registers.

Bit 3~0

ACS3~ACS0: Select A/D channel (when ACS4 is “0”)

0000: AIN.0

0001: AIN.1

0010: AIN.2

0011: AIN.3

0100: AIN.4

0101: AIN.5

0110: AIN.6

0111: AIN.7

1xxx: Undefined, must not be used

These are the A/D channel select control bits. As there is only one internal hardware

A/D converter each of the eight A/D inputs must be routed to the internal converter

using these bits. If bit ACS4 in the ADCR1 register is set high then the internal

temperature sensor will be routed to the A/D Converter and these ADC input channels

disconnected.

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