HT67F60 datasheet(152/242 Pages) HOLTEK

152 / 242 page

Rev. 1.50

152

March 06 , 2012

Rev. 1.50

153

March 06 , 2012

HT67F30/HT67F40/HT67F50/HT67F60

TinyPowerTM A/D Flash Type 8-Bit MCU with LCD & EEPRO

ADCR1 Register

Bit

Name

ACS4

V125EN

—

VREFS

—

ADCK2

ADCK1

ADCK0

R/W

—

R/W

—

R/W

POR

—

Bit 7

ACS4: Selecte Internal 1.25V as ADC input Control

0: Disable

1: Enable

This bit enables 1.25V to be connected to the A/D converter. The V125EN bit must

first have been set to enable the bandgap circuit 1.25V voltage to be used by the A/D

converter. When the ACS4 bit is set high, the bandgap 1.25V voltage will be routed to

the A/D converter and the other A/D input channels disconnected.

Bit 6

V125EN: Internal 1.25V Control

0: Disable

1: Enable

This bit controls the internal Bandgap circuit on/off function to the A/D converter.

When the bit is set high the bandgap voltage 1.25V can be used by the A/D converter.

If 1.25V is not used by the A/D converter and the LVR/LVD function is disabled then

the bandgap reference circuit will be automatically switched off to conserve power.

When 1.25V is switched on for use by the A/D converter, a time tBG should be allowed

for the bandgap circuit to stabilise before implementing an A/D conversion.

Bit 5

unimplemented, read as "0"

Bit 4

VREFS: Selecte ADC reference voltage

0: Internal ADC power

1: VREF pin

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. If the

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

VDD.

Bit 3

unimplemented, read as "0"

Bit 2~0

ADCK2, ADCK1, 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: Undefined

These three bits are used to select the clock source for the A/D converter.

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