MC68HC705V12CFN MOTOROLA [Motorola, Inc], MC68HC705V12CFN Datasheet - Page 134

• Manufacturer Part Number: MC68HC705V12CFN
• Description: The Motorola microcontroller
• Manufacturer: MOTOROLA [Motorola, Inc]

Analog-to-Digital (A/D) Converter
13.5 A/D Status and Control Register
Advance Information
134
Address:
This subsection describes the function of the A/D status and control
register.
COCO — Conversions Complete Bit
ADRC — RC Oscillator Control Bit
ADON — A/D On Bit
Reset:
Read:
Write:
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 data
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.
When the A/D is turned on (ADON = 1), it requires a time, t
the current sources to stabilize, and results can be inaccurate during
this time. This bit turns on the charge pump.
Figure 13-1. A/D Status and Control Register (ADSCR)
$001E
COCO
Bit 7
0
Analog-to-Digital (A/D) Converter
= Unimplemented
ADRC
6
0
ADON
5
0
CH4
4
0
CH3
3
0
MC68HC705V12
CH2
2
0
CH1
1
0
MOTOROLA
ADON
RCON
—
Rev. 3.0
Bit 0
CH0
0
, for
, to