HT66F20 datasheet(133/250 Pages) HOLTEK

133 / 250 page

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Rev. 1.20

133

June 4, 2010

· ADCR0 Register

¨ HT66F20/HT66F30/HT66F40/HT66F50

Bit

76543210

Name

START

EOCB

ADOFF

ADRFS

ACS2

ACS1

ACS0

R/W

POR

0110

000

Bit 7

START: Start the A/D conversion

®1®0 : start

®1

: reset the A/D converter and set EOCB to

²1²

This bit is used to initiate an A/D conversion process. The bit is normally low but if set high and

then cleared low again, the A/D converter will initiate a conversion process. When the bit is set

high the A/D converter will be reset.

Bit 6

EOCB: End of A/D conversion flag

0: A/D conversion ended

1: A/D conversion in progress

This read only flag is used to indicate when an A/D conversion process has completed. When

the conversion process is running the bit will be high.

Bit 5

ADOFF : 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 ADOFF=1 before entering IDLE/SLEEP Mode for saving

power.

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

Bit 4

ADRFS: ADC Data Format Control

0: ADC Data MSB is ADRH bit 7, LSB is ADRL bit 4

1: ADC Data MSB is ADRH bit 3, LSB is ADRL bit 0

This bit controls the format of the 12-bit converted A/D value in the two A/D data registers.

Details are provided in the A/D data register section.

Bit 3

unimplemented, read as

²0²

Bit 2~0

ACS2, ACS1, ACS0: Select A/D channel (when ACS4 is

²0²)

000: AN0

001: AN1

010: AN2

011: AN3

100: AN4

101: AN5

110: AN6

111: AN7

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.

If bit ACS4 in the ADCR1 register is set high then the internal 1.25V will be routed to the A/D

Converter.

HT66F20 Datasheet(PDF) 133 Page - Holtek Semiconductor Inc

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