MC68HC708MP16 Datasheet, PDF (361/398 Pages) Freescale Semiconductor, Inc – Microcontrollers

Analog-to-Digital Converter (ADC)
ADCO — ADC Continuous Conversion
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 14 ADC channels. The 14 channels are
detailed in Table 19-1. Take care to prevent switching noise from
corrupting the analog signal when simultaneously using a port pin as
both an analog and digital input. (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.
NOTE: Recovery from the disabled state requires one conversion cycle to
stabilize.
The voltage levels supplied from internal reference nodes as
specified in Table 19-1 are used to verify the operation of the ADC
converter both in production test and for user applications.
MC68HC708MP16 — Rev. 3.1
Freescale Semiconductor
Analog-to-Digital Converter (ADC)
Technical Data
361