HT68F03 datasheet(97/139 Pages) HOLTEK

97 / 139 page

HT66F03/HT66F04/HT68F03/HT68F04

Rev. 1.00

April 16, 2010

· ADCR0 Register

¨ HT66F03/HT66F04

Bit

76543210

Name

START

EOCB

ADOFF

ADRFS

¾¾

ACS1

ACS0

R/W

¾¾

R/W

POR

0110

¾¾

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 3~2

unimplemented, read as

²0²

Bit 1~0

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

²0²)

00: AN0

01: AN1

10: AN2

11: AN3

These are the A/D channel select control bits. As there is only one internal hardware A/D

converter each of the four 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 reference voltage source

will be routed to the A/D Converter.

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