MC68HC08AS32 Datasheet, PDF (316/394 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

Analog-to-Digital Converter (ADC)
When the AIEN bit is a logic 1, the COCO bit selects CPU interrupts
when clear. COCO does not get set after each conversion while
AIEN = 1.
1 = conversion completed (AIEN = 0)
0 = conversion not completed (AIEN = 0)
or
0 = CPU interrupt enabled (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
allowed when this bit is cleared. Reset clears the ADCO bit.
1 = Continuous ADC conversion
0 = One ADC conversion
ADCH[4:0] — ADC Channel Select Bits
ADCH4, ADCH3, ADCH2, ADCH1, and ADCH0 form a 5-bit field
which is used to select one of the ADC channels. The five channel
select bits are detailed in Table 19-1. Care should be taken when
using a port pin as both an analog and a digital input simultaneously
to prevent switching noise from corrupting the analog signal. (See
Table 19-1.)
The ADC subsystem is turned off when the channel select bits are all
set to one. This feature allows for reduced power consumption for the
MCU when the ADC is not used. Reset sets all of these bits to a
logic 1.
NOTE: Recovery from the disabled state requires one conversion cycle to
stabilize.
Advance Information
316
Analog-to-Digital Converter (ADC)
MC68HC08AS32 — Rev. 3.0
MOTOROLA