HT45F43 datasheet(76/152 Pages) HOLTEK

76 / 152 page

Bit 2~0

ACS2, ACS1, ACS0: Select A/D channel

000: AN0

001: AN1

010: AN2

011: AN3

100: AN4

101: AN5

110: Op Amp 1 output (A1E)

111: Op Amp 2 output (A2E)

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.

ACSR Register

Bit

76543210

Name

ADONB

VRSEL

¾¾

ADCS2

ADCS1

ADCS0

R/W

¾¾

R/W

POR

¾¾

000

Bit 7

unimplemented, read as

²1²

Bit 6

ADONB: ADC module power on/off control bit

0: ADC module power on

1: ADC module 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.

Note: 1. it is recommended to set ADONB=1 before entering IDLE/SLEEP Mode for saving

power.

2. ADONB=1 will power down the ADC module.

Bit 5

VRSEL: 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 4~3

unimplemented, read as

²0²

Bit 2~0

ADCS2, ADCS1, ADCS0: Select ADC clock source

000: fSYS/2

001: fSYS/8

010: fSYS/32

011: Undefined

100: fSYS

101: fSYS/4

110: fSYS/16

111: Undefined

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

Rev. 1.20

September 15, 2011

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

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