mc68hc705v12 Freescale Semiconductor, Inc, mc68hc705v12 Datasheet - Page 134

• Manufacturer Part Number: mc68hc705v12
• Description: M68hc05-based Mcu Hc05 Freescale Semiconductor
• Manufacturer: Freescale Semiconductor, Inc

Analog-to-Digital (A/D) Converter
13.5 A/D Status and Control Register
Advance Information
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.
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 13-1. A/D Status and Control Register (ADSCR)
$001E
COCO
Bit 7
0
Analog-to-Digital (A/D) Converter
Go to: www.freescale.com
= Unimplemented
ADRC
6
0
ADON
5
0
CH4
4
0
CH3
3
0
MC68HC705V12
CH2
2
0
CH1
1
0
ADON
RCON
—
Rev. 3.0
Bit 0
CH0
0
, for
, to