MC68HC908KX2 MOTOROLA [Motorola, Inc], MC68HC908KX2 Datasheet - Page 254

• Manufacturer Part Number: MC68HC908KX2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Analog-to-Digital Converter (ADC)
Technical Data
254
NOTE:
ADICLK — ADC Input Clock Select Bit
During the conversion process, changing the ADC clock will result in an
incorrect conversion.
ADICLK selects either bus clock or the oscillator output clock
(CGMXCLK) as the input clock source to generate the internal ADC
rate clock. Reset selects CGMXCLK as the ADC clock source.
The ADC requires a clock rate of approximately 1 MHz for correct
operation. If the selected clock source is not fast enough, the ADC will
generate incorrect conversions. See
the Internal Clock
1 = Internal bus clock
0 = Oscillator output clock (CGMXCLK)
f
ADIC
X = don’t care
ADIV2
Analog-to-Digital Converter (ADC)
0
0
0
0
1
=
Ã
f
CGMXCLK
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
Table 17-2. ADC Clock Divide Ratio
ADIV1
X
0
0
1
1
Generator.
ADIV[2:0]
or bus frequency
ADIV0
X
0
1
0
1
20.10 Trimmed Accuracy of
1 MHz
ADC input clock
ADC input clock
ADC input clock
ADC input clock
ADC input clock
ADC Clock Rate
16
1
2
4
8
MOTOROLA