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參數(shù)資料
| 型號： | MC68HC05L1B |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56 |
| 封裝： | SDIP-56 |
| 文件頁數(shù)： | 50/102頁 |
| 文件大小： | 632K |
| 代理商： | MC68HC05L1B |
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MC68HC05L1
MOTOROLA
6-1
ANALOG TO DIGITAL CONVERTER
6
ANALOG TO DIGITAL CONVERTER
The analog to digital converter system consists of a single 8-bit successive approximation
converter and a 16-channel multiplexer. Six of the channels are available for output, and the other
ten channels are dedicated to internal test functions. There is one 8-bit Result Data register
(address $08) and one 8-bit Status/Control register (address $09). The reference supply, VRH and
VRL for the converter uses two input pins (shared with PC6 and PC7) instead of the power supply
lines, because drops caused by loading in the power supply lines would degrade the accuracy of
the A/D conversion. An internal RC oscillator is available if the bus speed is low enough to degrade
the A/D accuracy. An ADON bit allows the A/D to be switched off to reduce power consumption,
which is particularly useful in the Wait mode.
Figure 6-1 A/D Converter Block Diagram
CH3
CH2
CH1
CH0
COCO
ADRC
ADON
8-bit capacitive DAC
with sample and hold
Successive approximation
register and control
Result
A/D Status/Control Register
Analog
MUX
(Channel
assignment)
A/D Result Register
VRH
VRL
AN0
VRH
VRL
(VRH+VRL)/2
AN1
AN2
AN3
AN4
AN5
TPG
49
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