HCS08 datasheet(141/316 Pages) NXP

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Analog-to-Digital Converter (S08ADCV1)

MC9S08SG8 MCU Series Data Sheet, Rev. 8

Freescale Semiconductor

141

Figure 9-14. Initialization Flowchart for Example

9.6

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.

9.6.1

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.

9.6.1.1

Analog Supply Pins

The ADC module has analog power and ground supplies (VDDAD and VSSAD) which are available as

separate pins on some devices. On other devices, VSSAD is shared on the same pin as the MCU digital VSS,

and on others, both VSSAD and VDDAD 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 VDDAD and VSSAD must be connected to the same voltage potential

as their corresponding MCU digital supply (VDD and VSS) and must be routed carefully for maximum

noise immunity and bypass capacitors placed as near as possible to the package.

YES

RESET

INITIALIZE ADC

ADCCFG = $98

ADCSC1 = $41

ADCSC2 = $00

CHECK

COCO=1?

READ ADCRH

THEN ADCRL TO

CLEAR COCO BIT

CONTINUE

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