mc68hc08qa24 Freescale Semiconductor, Inc, mc68hc08qa24 Datasheet - Page 282

• Manufacturer Part Number: mc68hc08qa24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Analog-to-Digital Converter (ADC)
Technical Data
280
NOTE:
NOTE:
ADCO — ADC Continuous Conversion Bit
ADCH[4:0] — ADC Channel Select Bits
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.
Recovery from the disabled state requires one conversion cycle to
stabilize.
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.
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
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. Reset sets all of these bits to a
logic 1.
1 = Continuous ADC conversion
0 = One ADC conversion
Analog-to-Digital Converter (ADC)
Table
19-1.
Freescale Semiconductor
MC68HC08QA24