s908ab32ag0cfue Freescale Semiconductor, Inc, s908ab32ag0cfue Datasheet - Page 238
s908ab32ag0cfue
Manufacturer Part Number
s908ab32ag0cfue
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.S908AB32AG0CFUE.pdf
(392 pages)
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Analog-to-Digital Converter (ADC)
Technical Data
238
ADICLK — ADC Input Clock Select Bit
ADICLK selects either the 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.
1 = Internal bus clock
0 = External clock (CGMXCLK)
X = don’t care
ADIV2
Analog-to-Digital Converter (ADC)
0
0
0
0
1
ADC input clock frequency
-----------------------------------------------------------------------
Table 14-2. ADC Clock Divide Ratio
ADIV1
X
0
0
1
1
ADIV[2:0]
ADIV0
X
0
1
0
1
ADC input clock ÷ 1
ADC input clock ÷ 2
ADC input clock ÷ 4
ADC input clock ÷ 8
ADC input clock ÷ 16
=
ADC Clock Rate
1MHz
MC68HC908AB32
Freescale Semiconductor
—
Rev. 1.1
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