HT68F03 datasheet(98/139 Pages) HOLTEK

98 / 139 page

HT66F03/HT66F04/HT68F03/HT68F04

Rev. 1.00

April 16, 2010

· ADCR1 Register

¨ HT66F03/HT66F04

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 tBG 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. When the A/D

converter reference voltage is supplied on the external VREF pin which is pin-shared with other

functions, all of the pin-shared functions except VREF on this pin are disabled.

Bit 3

unimplemented, read as

²0²

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.

HT68F03 датащи(PDF) 98 Page - Holtek Semiconductor Inc

HT68F03 датащи(HTML) 98 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL