MC68HC908LJ12CPB FREESCALE [Freescale Semiconductor, Inc], MC68HC908LJ12CPB Datasheet - Page 309

• Manufacturer Part Number: MC68HC908LJ12CPB
• Description: 8-bit microcontroller units
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Analog-to-Digital Converter (ADC)
15.8 I/O Registers
15.8.1 ADC Status and Control Register
Technical Data
310
Address:
These I/O registers control and monitor operation of the ADC:
This section describes the function of the ADC status and control
register (ADSCR). Writing ADSCR aborts the current conversion and
initiates a new conversion.
COCO — Conversions Complete Bit
AIEN — ADC Interrupt Enable Bit
Reset:
Read:
Write:
•
•
•
When the AIEN bit is a logic 0, the COCO is a read-only bit which is
set each time a conversion is completed. This bit is cleared whenever
the ADSCR is written, or whenever the ADC clock control register is
written, or whenever the ADC data register low, ADRL, is read.
If the AIEN bit is logic 1, the COCO bit always read as logic 0, CPU to
service the ADC interrupt will be generated at the end if an ADC
conversion. Reset clears the COCO bit.
When this bit is set, an interrupt is generated at the end of an ADC
conversion. The interrupt signal is cleared when the data register,
ADR0, is read or the ADSCR is written. Reset clears the AIEN bit.
Figure 15-4. ADC Status and Control Register (ADSCR)
1 = Conversion completed (AIEN = 0)
0 = Conversion not completed (AIEN = 0)/CPU interrupt (AIEN=1)
1 = ADC interrupt enabled
0 = ADC interrupt disabled
ADC status and control register, ADSCR
ADC data register, ADRH:ADRL
ADC clock register, ADCLK
$003C
COCO
Analog-to-Digital Converter (ADC)
0
= Unimplemented
AIEN
0
ADCO
0
ADCH4
1
ADCH3
1
MC68HC908LJ12
ADCH2
Freescale Semiconductor
1
ADCH1
1
—
Rev. 2.1
ADCH0
1