MC908AB32CFUE Datasheet, PDF (235/392 Pages) Freescale Semiconductor, Inc – Microcontrollers

Analog-to-Digital Converter (ADC)
14.8.1 ADC Status and Control Register (ADSCR)
Function of the ADC status and control register is described here.
Address: $0038
Bit 7
6
5
4
3
2
1
Bit 0
Read:
COCO AIEN ADCO ADCH4 ADCH3 ADCH2 ADCH1 ADCH0
Write:
Reset: 0
0
0
1
1
1
1
1
Figure 14-3. ADC Status and Control Register (ADSCR)
COCO — Conversions Complete
When the AIEN bit is a logic 0, the COCO is a read-only bit which is
set each time a conversion is completed except in the continuous
conversion mode where it is set after the first conversion. This bit is
cleared whenever the ADSCR is written or whenever the ADR is read.
If the AIEN bit is a logic 1, the COCO becomes a read/write bit, which
should be cleared to logic 0 for CPU to service the ADC interrupt
request. Reset clears the COCO bit.
1 = Conversion completed (AIEN=0)
0 = Conversion not completed (AIEN=0)/CPU interrupt (AIEN=1)
AIEN — ADC Interrupt Enable 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 is
read or the status/control register is written.Reset clears the AIEN bit.
1 = ADC interrupt enabled
0 = ADC interrupt disabled
ADCO — ADC Continuous Conversion Bit
When set, the ADC will convert samples continuously and update the
ADR register at the end of each conversion. Only one conversion is
completed between writes to the ADSCR when this bit is cleared.
Reset clears the ADCO bit.
1 = Continuous ADC conversion
0 = One ADC conversion
MC68HC908AB32 — Rev. 1.1
Freescale Semiconductor
Analog-to-Digital Converter (ADC)
Technical Data
235