mc68hc908as60 Freescale Semiconductor, Inc, mc68hc908as60 Datasheet - Page 417

• Manufacturer Part Number: mc68hc908as60
• Description: Mc68hc908as60 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

MC68HC908AS60 — Rev. 1.0
NOTE:
ADICLK — ADC Input Clock Register Bit
During the conversion process, changing the ADC clock will result in an
incorrect conversion.
ADICLK selects either bus clock or CGMXCLK as the input clock
source to generate the internal ADC clock. Reset selects CGMXCLK
as the ADC clock source.
If the external clock (CGMXCLK) is equal to or greater than 1 MHz,
CGMXCLK can be used as the clock source for the ADC. If
CGMXCLK is less than 1 MHz, use the PLL-generated bus clock as
the clock source. As long as the internal ADC clock is at
approximately 1 MHz, correct operation can be guaranteed. See
24.7 ADC
Freescale Semiconductor, Inc.
For More Information On This Product,
1 = Internal bus clock
0 = External clock (CGMXCLK)
X = Don’t care
ADIV2
Analog-to-Digital Converter (ADC-15)
0
0
0
0
1
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Characteristics.
1 MHz =
Table 23-2. ADC Clock Divide Ratio
ADIV1
X
0
0
1
1
f
XCLK
ADIV0
or bus frequency
ADIV[2:0]
X
0
1
0
1
Analog-to-Digital Converter (ADC-15)
ADC input clock
ADC input clock
ADC input clock
ADC input clock
ADC input clock
ADC Clock Rate
Technical Data
16
1
2
4
8
I/O Registers