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參數(shù)資料
| 型號(hào)： | MC68HC05BD7B |
| 廠(chǎng)商： | MOTOROLA INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP42 |
| 封裝： | SDIP-42 |
| 文件頁(yè)數(shù)： | 69/85頁(yè) |
| 文件大?。?/td> | 302K |
| 代理商： | MC68HC05BD7B |
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SECTION 12: A/D CONVERTER
MOTOROLA
Page 61
MC68HC05BD7 Rev. 2.0
GENERAL RELEASE SPECIFICATION
PRELIMINARY
SECTION 12
A/D CONVERTER
12.1
Introduction
The Analog-to-Digital Converter (ADC) system consists of four analog input channels and
a single 6-bit D/A Converter and Comparator, with continuous conversion. A result flag
indicates if the comparator output is above or below the analog Input. ADC is disabled by
setting AD5 to AD0 bits of ADC Control/Status Register to all 1’s. This disable function is
mainly for low power application.
Figure 12-1: Structure of A/D Converter
12.2
Input
The ADC has four multiplexed input channels. Only one of the four channels will be
selected by CHSL1 and CHSL0 bits as analog input.
12.2.1
ADC0-ADC3
The ADC0 to ADC3 inputs are multiplexed with the PC2 to PC5 port pins. They are selected
as ADC input then the corresponding AD0-AD3 bit in the CR2 register is one. The user can
use the CHSL1 and CHSL0 bits to select one of the four channels to do the A/D Conversion
and get the approximate digital value of each input channel.
+
-
Vdd
2R
R
2R
RESULT
AD5
AD3
AD2
AD0
ADC0 or ADC1 or ADC2 or ADC3
R
2R
AD4
2R
AD1
R
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