MC9S08DN60 Datasheet, PDF (187/354 Pages) Freescale Semiconductor, Inc – Microcontrollers

RESET
Chapter 10 Analog-to-Digital Converter (S08ADC12V1)
INITIALIZE ADC
ADCCFG = $98
ADCSC2 = $00
ADCSC1 = $41
CHECK
NO
COCO=1?
YES
READ ADCRH
THEN ADCRL TO
CLEAR COCO BIT
CONTINUE
Figure 10-14. Initialization Flowchart for Example
10.6 Application Information
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.
10.6.1 External Pins and Routing
The following sections discuss the external pins associated with the ADC module and how they should be
used for best results.
10.6.1.1 Analog Supply Pins
The ADC module has analog power and ground supplies (V_DDAD and V_SSAD) which are available as
separate pins on some devices. On other devices, V_SSAD is shared on the same pin as the MCU digital V_SS,
and on others, both V_SSAD and V_DDAD are shared with the MCU digital supply pins. In these cases, there
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_DDAD and V_SSAD must be connected to the same voltage potential
as their corresponding MCU digital supply (V_DD and V_SS) and must be routed carefully for maximum
noise immunity and bypass capacitors placed as near as possible to the package.
MC9S08DN60 Series Data Sheet, Rev 2
Freescale Semiconductor
187