參數(shù)資料
型號(hào): MC68HC05P9AMDW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 28/158頁
文件大?。?/td> 3885K
代理商: MC68HC05P9AMDW
ADC
I/O Registers
ADC
ADRC — ADC RC (Oscillator)
This read/write bit turns on the internal RC oscillator to drive the ADC.
If the internal clock frequency (f
OP) is less than 1 MHz, ADRC must be
set. When the RC oscillator is turned on, it requires a time, t
ADRC, to
stabilize, and results can be inaccurate during this time. Resets clear
the ADRC bit.
1 = Internal RC oscillator drives ADC
0 = Internal clock drives ADC
When the internal RC oscillator is being used as the ADC clock, two
limitations apply:
Because of the frequency tolerance of the RC oscillator and its
asynchronism with the internal clock, the conversion complete flag
must be used to determine when a conversion sequence is
complete.
The conversion process runs at the nominal 1.5-MHz rate, but the
conversion results must be transferred to the ADC data register
synchronously with the internal clock; therefore, the conversion
process is limited to a maximum of one channel every internal
clock cycle.
ADON — ADC On
This read/write bit turns on the ADC. When the ADC is on, it requires
a time, t
ADON, for the current sources to stabilize. During this time,
results can be inaccurate. Resets clear the ADON bit.
1 = ADC turned on
0 = ADC turned off
Bits 4 and 3 — Not used
Bits 4 and 3 always read as logic 0s.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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MC68HC05P9AMP 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit
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