MC68HC705P9CDW FREESCALE [Freescale Semiconductor, Inc], MC68HC705P9CDW Datasheet - Page 134

• Manufacturer Part Number: MC68HC705P9CDW
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Analog-to-Digital Converter (ADC)
11.7 I/O Registers
11.7.1 ADC Status and Control Register
Technical Data
134
The following registers control and monitor operation of the ADC:
The ADC status and control register (ADSCR) contains a conversion
complete flag and four writable control bits. Writing to ADSCR clears the
conversion complete flag and starts a new conversion sequence.
CCF — Conversion Complete Flag
ADRC — ADC RC (Oscillator)
$001E
Reset:
Read:
Write:
•
•
This read-only bit is automatically set when an analog-to-digital
conversion is complete, and a new result can be read from the ADC
data register. Clear the CCF bit by writing to the ADC status and
control register or by reading the ADC data register. Resets clear the
CCF bit.
This read/write bit turns on the internal RC oscillator to drive the ADC.
If the internal clock frequency (f
set. When the RC oscillator is turned on, it requires a time, t
stabilize, and results can be inaccurate during this time. Resets clear
the ADRC bit.
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 11-3. ADC Status and Control Register (ADSCR)
1 = Conversion complete
0 = Conversion not complete
1 = Internal RC oscillator drives ADC
0 = Internal clock drives ADC
ADC status and control register (ADSCR)
ADC data register (ADDR)
CCF
Bit 7
Analog-to-Digital Converter (ADC)
0
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= Unimplemented
ADRC
6
0
ADON
5
0
OP
4
0
0
) is less than 1 MHz, ADRC must be
3
0
0
MC68HC705P9 — Rev. 4.0
CH2
2
0
CH1
1
0
MOTOROLA
ADRC
Bit 0
CH0
, to
0