HT66F13 datasheet(112/173 Pages) HOLTEK

112 / 173 page

ADCR1 Register

Bit

76543210

Name

ACS4

V125EN

VREFS

ADCK2

ADCK1

ADCK0

R/W

POR

000

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 t

BG should be allowed for the bandgap circuit to stabilise before implementing

an A/D conversion.

Bit 5

unimplemented, read as

²0²

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

²0²

Bit 2~0

ADCK2, ADCK1, ADCK0: Select ADC clock source

000: f

SYS

001: f

SYS/2

010: f

SYS/4

011: f

SYS/8

100: f

SYS/16

101: f

SYS/32

110: f

SYS/64

111: Undefined

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

HT66F13/HT66F14/HT66F15

Enhanced A/D Flash Type MCU

Rev. 1.10

112

February 9, 2011

HT66F13 Datasheet(PDF) 112 Page - Holtek Semiconductor Inc

HT66F13 Datasheet(HTML) 112 Page - Holtek Semiconductor Inc

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