HT66F13 datasheet(109/173 Pages) HOLTEK

109 / 173 page

Analog to Digital Converter

The need to interface to real world analog signals is a common requirement for many electronic

systems. However, to properly process these signals by a microcontroller, they must first be converted

into digital signals by A/D converters. By integrating the A/D conversion electronic circuitry into the

microcontroller, the need for external components is reduced significantly with the corresponding

follow-on benefits of lower costs and reduced component space requirements.

A/D Overview

The devices contain a multi-channel analog to digital converter which can directly interface to external

analog signals, such as that from sensors or other control signals and convert these signals directly into

a 12-bit digital value.

The accompanying block diagram shows the overall internal structure of the A/D converter, together

with its associated registers.

A/D Converter Register Description

Overall operation of the A/D converter is controlled using six registers. A read only register pair exists

to store the ADC data 12-bit value. The remaining three or four registers are control registers which

setup the operating and control function of the A/D converter.

Name

Bit

76543210

ADRL(ADRFS=0)

¾¾¾¾

ADRL(ADRFS=1)

ADRH(ADRFS=0)

D11

D10

ADRH(ADRFS=1)

¾¾¾¾

D11

D10

ADCR0

START

EOCB

ADOFF

ADRFS

¾¾

ACS1

ACS0

ADCR1

ACS4

V125EN

VREFS

ADCK2

ADCK1

ADCK0

ACER

¾¾¾¾

ACE3

ACE2

ACE1

ACE0

A/D Converter Register List

Rev. 1.10

109

February 9, 2011

HT66F13/HT66F14/HT66F15

Enhanced A/D Flash Type MCU

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 B 0 / 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 ,

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

HT66F13 Datasheet(PDF) 109 Page - Holtek Semiconductor Inc

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