MC68HC08AZ16 Datasheet, PDF (310/527 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Analog-to-Digital Converter (ADC)
I/O registers
AIEN - ADC interrupt enable
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 AIEN bit.
1 = ADC Interrupt enabled
0 = ADC Interrupt disabled
ADCO - ADC continuous conversion
When set, the ADC will continuously convert samples 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 eight ADC channels. The eight
channels are detailed in the following table. Care should be taken
when using a port pin as both an analog and digital input
simultaneously to prevent switching noise from corrupting the analog
signal. See Table 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.
NOTE: Recovery from the disabled state requires one conversion cycle to
stabilize.
The voltage levels supplied from internal reference nodes as
specified in the table are used to verify the operation of the ADC
converter both in production test and for user applications.
9-adc
MOTOROLA
Analog-to-Digital Converter (ADC)
MC68HC08AZ32
309