M68HC05 datasheet(101/302 Pages) FREESCALE

101 / 302 page

MC68HC05B6

Rev. 4.1

Freescale

8-3

ANALOG TO DIGITAL CONVERTER

8.2

A/D registers

8.2.1

Port D data register (PORTD)

Port D is an input-only port which routes the eight analog inputs to the A/D converter. When the

A/D converter is disabled, the pins are configured as standard input-only port pins, which can be

read via the port D data register.

Note:

When the A/D function is enabled, pins PD0–PD7 will act as analog inputs. Using a pin

or pins as A/D inputs does not affect the ability to read port D as static inputs; however,

reading port D during an A/D conversion sequence may inject noise on the analog

inputs and result in reduced accuracy of the A/D result.

Performing a digital read of port D with levels other than VDD or VSS on the pins will

result in greater power dissipation during the read cycle, and may give unpredictable

results on the corresponding port D pins.

8.2.2

A/D result data register (ADDATA)

ADDATA is a read-only register which is used to store the results of A/D conversions. Each result

is loaded into the register from the SAR and the conversion complete flag, COCO, in the ADSTAT

Address

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

State

on reset

Port D data (PORTD)

$0003

PD7

PD6

PD5

PD4

PD3

PD2

PD1

PD0

Undefined

Address

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

State

on reset

A/D data (ADDATA)

$0008

0000 0000

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