MC68HC908MR8 Datasheet, PDF (320/372 Pages) Motorola, Inc – Microcontrollers

Analog-to-Digital Converter (ADC)
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 detailed in Table
18-1. Take care to prevent switching noise from corrupting the analog
signal when simultaneously using a port pin as both an analog and
digital input.
The ADC subsystem is turned off when the channel select bits are all
set to 1. 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
Table 18-1 are used to verify the operation of the ADC converter both in
production test and for user applications.
Technical Data
320
Analog-to-Digital Converter (ADC)
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor