mc9s08ac32 Freescale Semiconductor, Inc, mc9s08ac32 Datasheet - Page 156
mc9s08ac32
Manufacturer Part Number
mc9s08ac32
Description
Hcs08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S08AC32.pdf
(348 pages)
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Chapter 9 Analog-to-Digital Converter (S08ADC10V1)
9.7
This section contains information for using the ADC module in applications. The ADC has been designed
to be integrated into a microcontroller for use in embedded control applications requiring an A/D
converter.
9.7.1
The following sections discuss the external pins associated with the ADC module and how they should be
used for best results.
9.7.1.1
The ADC module has analog power and ground supplies (V
separate pins on some devices. On other devices, V
and on others, both V
are separate pads for the analog supplies which are bonded to the same pin as the corresponding digital
supply so that some degree of isolation between the supplies is maintained.
When available on a separate pin, both V
as their corresponding MCU digital supply (V
noise immunity and bypass capacitors placed as near as possible to the package.
156
Application Information
External Pins and Routing
Analog Supply Pins
SSAD
and V
Figure 9-13. Initialization Flowchart for Example
DDAD
MC9S08AC60 Series Data Sheet, Rev. 2
are shared with the MCU digital supply pins. In these cases, there
DDAD
CLEAR COCO BIT
THEN ADCRL TO
INITIALIZE ADC
ADCCFG = $98
ADCSC2 = $00
ADCSC1 = $41
READ ADCRH
CONTINUE
COCO=1?
DD
and V
CHECK
RESET
and V
SSAD
YES
SSAD
SS
is shared on the same pin as the MCU digital V
must be connected to the same voltage potential
) and must be routed carefully for maximum
NO
DDAD
and V
SSAD
) which are available as
Freescale Semiconductor
SS
,
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