68HC705SP7 datasheet(112/230 Pages) FREESCALE

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Analog Subsystem

General Release Specification

MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0

Analog Subsystem

Table 8-3. A/D Conversion Options

A/D

Option

Mode

Charge

Control

A/D Options

Current Flow To/From PB0/AN0

ISEN

ATD2

ATD1

CHG

Disabled

Current

Source and

Discharge

Disabled

Current control disabled, no source or sink current

Manual

Charge and

Discharge

1000

Begin sinking current when the CHG bit is cleared

and continue to sink current until the CHG bit is set.

1001

Begin sourcing current when the CHG bit is set and

continue to source current until the CHG bit is

cleared.

Manual

Charge and

Automatic

Discharge

1010

Begin sinking current when the CHG bit is cleared

and continue to sink current until the CHG bit is set.

(The CHG bit is cleared by writing a logical zero to

it or when the CPF2 ﬂag bit is set.)

1011

Begin sourcing current when the CHG bit is set; and

continue to source current until the CHG bit is

cleared. (The CHG bit is set by writing a logical one

to it or cleared when the CPF2 ﬂag bit is set.)

Automatic

Charge and

Discharge

(TOF–ICF)

Synchronized

to Timer

1100

The CHG bit remains cleared until the next timer

TOF occurs.

1101

The CHG bit remains set until the next timer ICF

occurs.

Automatic

Charge and

Discharge

(OCF–ICF)

Synchronized

to Timer

1110

The CHG bit remains cleared until the next timer

OCF occurs.

1111

The CHG bit remains set until the next timer ICF

occurs.

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