HT85F2270 datasheet(156/226 Pages) HOLTEK

156 / 226 page

Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

ADCR1 Register

SFR Address: F2h

Bit

Name

ACS4

TSEN

—

VREFAS

VREFIS

ADCK�

ADCK1

ADCK0

R/W

—

R/W

POR

—

Bit 7

ACS4: Internal temperature sensor ADC input control

0: Disable

1: Enable

This bit enables the temperature sensor to the A/D converter. The TSEN bit must first

have been set to enable the temperature sensor circuit. When the ACS4 bit is set high,

the temperature sensor will be routed to the A/D converter and the other A/D input

channels disconnected.

Bit 6

TSEN: Internal temperature sensor control

0: Disable

1: Enable

This bit controls the internal temperature sensor function to the A/D converter. When

the bit is set high the temperature sensor can be used by the A/D converter.

Bit 5

Unimplemented, read as "0"

Bit 4

VREFAS: ADC reference voltage select

0: VCCA3 pin

1: Externally supplied on VREF pin or internal voltage reference generator

This bit is used to select the reference voltage for the A/D converter. If the bit is high

then the A/D converter reference voltage is supplied on the external VREF pin or the

internal reference voltage, the choice being made using the VREFIS bit. If the pin is

low then the internal reference is used which is sourced from the power supply pin

VCCA3.

Bit 3

VREFIS: A/D and DAC reference voltage select

0: Externally supplied on VREF pin

1: Internal Voltage Reference

Bit 2~0

ADCK2~ADCK0: Select ADC clock source

000: fSYS

001: fSYS/2

010: fSYS/4

011: fSYS/8

100: fSYS/16

101: fSYS/32

110: fSYS/64

111: fSYS

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