HT68F03 datasheet(96/139 Pages) HOLTEK

96 / 139 page

HT66F03/HT66F04/HT68F03/HT68F04

Rev. 1.00

April 16, 2010

A / D C o n v e r t e r

P A 3 / A N 3

P A 2 / A N 2

P A 1 / A N 1

P A 0 / A N 0

A / D R e f e r e n c e V o l t a g e

A D R L

A D R H

A / D D a t a

R e g i s t e r s

V 1 2 5 E N

S T A R T

E O C B

A D O F F

V S S

P B 1 / V R E F

A D C K 2 ~ A D C K 0

f S Y S

A C E 3 ~ A C E 0

A C S 4 ,

A C S 1 ~ A C S 0

1 . 2 5 V

A / D C l o c k

V D D

A D O F F

B i t

V R E F S

B i t

A D R F S

b i t

¸ 2 N

( N = 0 ~ 6 )

A/D Converter Structure

A/D Converter Control Registers

ADCR0, ADCR1, ACERL

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

verter, three control registers known as ADCR0, ADCR1

and ACERL are provided. These 8-bit registers define

functions such as the selection of which analog channel

is connected to the internal A/D converter, the digitised

data format, the A/D clock source as well as controlling

the start function and monitoring the A/D converter end

of conversion status. The ACS1~ACS0 bits in the

ADCR0 register and ACS4 bit is the ADCR1 register de-

fine the ADC input channel number. As the device con-

tains only one actual analog to digital converter

hardware circuit, each of the individual 4 analog inputs

must be routed to the converter. It is the function of the

ACS4, ACS1 and ACS0 bits to determine which analog

channel input pins or internal 1.25V is actually con-

nected to the internal A/D converter.

The ACERL control register contains the ACER3~

ACER0 bits which determine which pins on Port A are

used as analog inputs for the A/D converter input and

which pins are not to be used as the A/D converter input.

Setting the corresponding bit high will select the A/D in-

put function, clearing the bit to zero will select either the

I/O or other pin-shared function. When the pin is se-

lected to be an A/D input, its original function whether it

is an I/O or other pin-shared function will be removed. In

addition, any internal pull-high resistors connected to

these pins will be automatically removed if the pin is se-

lected to be an A/D input.

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