HT45F43 datasheet(74/152 Pages) HOLTEK

74 / 152 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 contains 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 either a 12-bit digital value.

Part No.

Input Channels

A/D Channel Select Bits

Input Pins

HT45F43

ACS2~ACS0

AN0~AN5

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 five registers. A read only register pair

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

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

Name

Bit

76543210

ADCR

START

EOCB

¾¾¾

ACS2

ACS1

ACS0

ACSR

ADONB

VRSEL

¾¾

ADCS2

ADCS1

ADCS0

ADPCR

¾¾

PCR5

PCR4

PCR3

PCR2

PCR1

PCR0

A/D Converter Register List

Rev. 1.20

September 15, 2011

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

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

A N 0 o r I / O

A N 5 o r I / O

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

S T A R T

E O C B

A D O N B

V S S

P C 4 / V R E F

A D C S 2 ~ A D C S 0

f S Y S

P C R 5 ~ P C R 0

A C S 2 ~ A C S 0

A / D C l o c k

V D D

A D O N B

B i t

V R S E L

B i t

C l o c k

D i v i d e r

O P A 1 o u t p u t

O P A 2 o u t p u t

A/D Converter Structure

HT45F43 датащи(PDF) 74 Page - Holtek Semiconductor Inc

HT45F43 датащи(HTML) 74 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL