MC68HC705P9CS datasheet(131/160 Pages) FREESCALE

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Analog-to-Digital Converter (ADC)

Operation

MC68HC705P9 — Rev. 4.0

Technical Data

MOTOROLA

Analog-to-Digital Converter (ADC)

131

11.4 Operation

The A/D conversion process is ratiometric, using two reference voltages,

RH and VSS. Conversion accuracy is guaranteed only if VRH is equal to

DD.

11.4.1 Pin Functions

The ADC uses five pins and shares them with port C:

•

PC7/VRH

•

PC6/AN0, PC5/AN1, PC4/AN2, and PC3/AN3

11.4.1.1 PC7/VRH

The voltage reference high pin (PC7/VRH) supplies the high reference

voltage for the ratiometric conversion process. For ratiometric

conversion, the supply voltage of the analog source should be the same

as V

RH and be referenced to VSS.

Addr.

Name

Bit 76

1Bit 0

$001D

ADC Data Register

(ADDR)

See page 136.

Read:

Bit 7

Bit 0

Write:

Reset:

Unaffected by reset

$001E

ADC Status/Control Register

(ADSCR)

See page 134.

Read:

CCF

ADRC

ADON

CH2

CH1

CH0

Write:

Reset:

000

= Unimplemented

Figure 11-2. ADC I/O Register Summary

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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