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參數(shù)資料
| 型號： | MC68HC05L1FU |
| 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, PQFP64 |
| 封裝： | QFP-64 |
| 文件頁數(shù)： | 52/102頁 |
| 文件大小： | 632K |
| 代理商： | MC68HC05L1FU |
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MC68HC05L1
MOTOROLA
6-3
ANALOG TO DIGITAL CONVERTER
6
6.2
ADC Status/Control Register (ACR)
COCO - Conversion Complete Flag
1 (set)
–
Conversion complete; a new result can be read from the Result
register ($08).
0 (clear) –
No conversion since last reset.
ADRC - A/D RC Oscillator Control
The ADRC bit allows the user to use the internal RC oscillator, which is used to provide a
sufciently high clock rate to the A/D to ensure accuracy when the MCU is running at low speeds
(typically 1MHz CPU clock).
1 (set)
–
A/D uses RC clock as clock source.
0 (clear) –
A/D uses CPU clock as clock source.
When the RC oscillator is turned on, it requires a time tADRC to stabilize, and results can be
inaccurate during this time.
ADON -A/D Converter On
The ADON bit allows the user to enable/disable the A/D converter.
1 (set)
–
A/D converter is switched on.
0 (clear) –
A/D converter is switched off.
When the A/D is turned on, it requires a time tADON for the current sources to stabilize. During this
time A/D conversion results may be inaccurate.
Note:
To conserve power, set ADRC=ADON=0.
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
$09
COCO
ADRC
ADON
CH3
CH2
CH1
CH0
0000 0000
Table 6-1 A/D Clock Selection
ADRC
ADON
RC
oscillator
A/D
converter
Comments
0
OFF
A/D switched off
0
1
OFF
ON
A/D using CPU clock
1
0
ON
OFF
Allows the RC oscillator to stabilize
1
ON
A/D using RC oscillator clock
TPG
51
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