HT66F016 datasheet(74/116 Pages) HOLTEK

74 / 116 page

HT66F016/HT66F017/HT68F016/HT68F017

Rev. 1.00

May 14, 2012

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

P A 0 / A N 0

P A 1 / A N 1

P A 2 / A N 2

P A 3 / A N 3

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 A 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 and ACS1~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

contains

the

ACER3~ACER0 bits which determine which pins on

PA0~PA3 are used as analog inputs for the A/D con-

verter 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 input function, clearing the bit to zero will

select either the I/O or other pin-shared function. When

the pin is selected 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 selected to be an A/D input.

HT66F016 Datasheet(PDF) 74 Page - Holtek Semiconductor Inc

HT66F016 Datasheet(HTML) 74 Page - Holtek Semiconductor Inc

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