Digi NS9215, Hardware Reference Manual, Page: 477 / 517

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A N A L O G - T O - D I G I T A L C O N V E R T E R ( A D C ) M O D U L E
ADC Clock Configuration register
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477
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A D C C l o c k C o n f i g u r a t i o n r e g i s t e r
Address: 9003_9004
The ADC Clock Configuration register controls the ADC clock generator. The source
clock is the output of the PLL. The maximum ADC clock frequency is 14 MHz and the
conversion time is 14 clock cycles. This is the formula for the ADC clock:
ADC clock = PLL clock / (2 x (N+1))
Example
PLL clock frequency = 299.8272 MHz
N value = 10
ADC clock frequency:
ADC clock = 299.8272 MHz / (2 x (10+1)) = 13.6285 MHz
Wait states can be added to increase conversion time beyond 14 clock cycles.
Register
Register bit
assignment
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A D C O u t p u t R e g i s t e r s 0 - 7
Addresses: 9003_9008 / 9003_900C / 9003_9010 / 9003_9014 / 9003_9018 /
9003_901C / 9003_9020 / 9003_9024
The ADC Output registers provide CPU access for the ADC output for each channel.
13 12 11 10 9 8 7 6 5 4 3 2 1 0 15 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 16 30
WAIT
N Not used
Bit(s) Access Mnemonic Reset Description
D31:16 R/W WAIT N/A Number of additional clock cycles per conversion
cycle.
D15:10 R/W Not used 0 This field must be written to 0.
D09:00 R/W N 0 ADC clock converter.