MC68HC705P9CS datasheet(136/160 Pages) FREESCALE

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Analog-to-Digital Converter (ADC)

Technical Data

MC68HC705P9 — Rev. 4.0

136

Analog-to-Digital Converter (ADC)

MOTOROLA

To prevent excess power dissipation, do not use an ADC pin as an

analog input and a digital input at the same time.

Using one of the port pins as the ADC input does not affect the ability to

use the remaining port pins as digital inputs.

Reading a port pin that is selected as an analog input returns a logic

zero.

11.7.2 ADC Data Register

The ADC data register (ADDR) is a read-only register that contains the

result of the most recent analog-to-digital conversion.

11.8 Low-Power Modes

11.8.1 Stop Mode

The STOP instruction turns off the ADC and aborts any current and

pending conversions.

11.8.2 Wait Mode

The ADC continues to operate normally after the WAIT instruction. To

reduce power consumption in wait mode:

•

If the ADC is not being used, clear both the ADON and ADRC bits

before entering wait mode.

•

If the ADC is being used and the internal clock rate is above

1 MHz, clear the ADRC bit before entering wait mode.

$001D

Bit 7

54321

Bit 0

Read:

Bit 7

54321

Bit 0

Write:

Reset:

Unaffected by reset

Figure 11-4. ADC Data Register (ADDR)

Freescale Semiconductor, Inc.

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