參數(shù)資料
型號(hào): MC68HC705P9CDW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 41/160頁
文件大?。?/td> 2208K
代理商: MC68HC705P9CDW
Analog-to-Digital Converter (ADC)
I/O Registers
MC68HC705P9 — Rev. 4.0
Technical Data
MOTOROLA
Analog-to-Digital Converter (ADC)
135
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 4–2 — Not used
Bits 4–2 always read as logic zeros.
CH[2:0] — Channel Select Bits
These read/write bits select one of eight ADC input channels as
shown in Table 11-2. Channels 0–3 are the input pins, PC3/AN3,
PC4/AN2, PC5/AN1, and PC6/AN0. Channels 4–6 can be used for
reference measurements. Channel 7 is reserved for factory testing.
Table 11-2. ADC Input Channel Selection
CH[2:1:0]
Channel
Signal
000
0
AN0
001
1
AN1
010
2
AN2
011
3
AN3
100
4
VRH
101
5
(VRH + VSS) / 2
110
6
VSS
111
7
Reserved
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)PDF資料
PDF描述
MC68HC705P9DW 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
MC68HC705P9MS 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, CDIP28
MC68HC705P9CDW 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
MC68HC705P9VS 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, CDIP28
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