HT48R005 datasheet(38/62 Pages) HOLTEK

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HT48R005/HT46R005

Rev. 1.00

November 29, 2011

· ADRH, ADRL Register

ADRH

ADRL

Bit

7654321076543210

Name

D11

D10

¾¾¾¾

R/W

RRRRRRRRRRRR

¾¾¾¾

POR

xxxxxxxxxxxx

¾¾¾¾

²x² unknown

unimplemented, read as

²0²

D11~D0: ADC conversion data

· ADCR Register

Bit

76543210

Name

START

EOCB

PCR2

PCR1

PCR0

ACS1

ACS0

R/W

POR

00000

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

unimplemented, read as

²0²

Bit 4

PCR2: Define PA2 is A/D input or not

0: not A/D input

1: A/D input, AN2

Bit 3

PCR1: Define PA1 is A/D input or not

0: not A/D input

1: A/D input, AN1

Bit 2

PCR0: Define PA0 is A/D input or not

0: not A/D input

1: A/D input, AN0

Note that if the PCR2~PCR0 bits are all cleared to

²0², then the ADC module will enter power

down mode to reduce the power consumption.

Bit 2~0

ACS1, ACS0: Select A/D channel

00: AN0

01: AN1

10: AN2

11: Reserved

A/D Converter Control Registers

- ADCR, ACSR

To control the function and operation of the A/D con-

verter, two control registers known as ADCR and ACSR

are provided. These 8-bit registers define functions

such as the selection of which analog channel is con-

nected to the internal A/D converter, which pins are

used as analog inputs and which are used as normal

I/Os, the A/D clock source as well as controlling the start

function and monitoring the A/D converter end of con-

version status.

The PCR2~PCR0 bits in the ADCR register define the

channel number. As the device contains only one actual

analog to digital converter circuit, each of the individual

3 analog inputs must be routed to the converter. It is the

function of the ACS1~ACS0 bits in the ADCR register to

determine which analog channel is actually connected

to the internal A/D converter.

HT48R005 Datasheet(PDF) 38 Page - Holtek Semiconductor Inc

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