mc68hc05pv8 Freescale Semiconductor, Inc, mc68hc05pv8 Datasheet - Page 140

• Manufacturer Part Number: mc68hc05pv8
• Description: Hcmos Microcontroller Unit
• Manufacturer: Freescale Semiconductor, Inc

T echnical Data
10.6 A/D Registers
10.6.1 A/D Status and Control Register (ADSCR)
Technical Data
The following paragraphs describe the function of the A/D status and
control register.
COCO – Conversion Complete
ADRC – RC Oscillator On
$000F
Reset:
Read:
Write:
3.
This read-only status bit is set when a conversion is completed,
indicating that the A/D data register contains valid results. This bit is
cleared whenever the A/D status and control register is written and a
new conversion automatically started, or whenever the A/D register is
read. Once a conversion has been started by writing to the A/D status
and control register, conversions of the selected channel will continue
every 32 cycles until the A/D status and control register is written
again. In this continuous conversion mode, the A/D data register will
be filled with new data, and the COCO bit set, every 32 cycles. Data
from the previous conversion will be overwritten regardless of the
state of the COCO bit prior to writing.
When ADRC is set, the A/D section runs on the internal RC oscillator
instead of the CPU clock. The RC oscillator requires a time t
stabilize and results can be inaccurate during this time. See
Internal and Master
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 10-1 A/D Status and Control Register (ADSCR)
oscillator should be turned off, and the system clock used as the
conversion clock.
If the system clock is running faster than the RC oscillator, the RC
COCO
Bit 7
U
Analog to Digital Converter
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ADRC
U
6
Oscillator.
ADON
U
5
ADTST
U
4
CH3
U
3
MC68HC(8)05PV8/A — Rev. 1.9
CH2
U
2
CH1
U
1
RCON
10.5
Bit 0
CH0
U
to