Bosch PPP6 B8 Series Manual de Serviço descarregar pdf (Página 355)

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Analog-to-Digital Converter

ATD Operation In Different MCU Modes

MC68HC912D60A — Rev. 3.1 Technical Data

Freescale Semiconductor Analog-to-Digital Converter 355

can be performed. Note that powering up the module does not reset the

module since the register file is not initialized.

In power down mode, the control and result registers are still accessible.

18.5.2 IDLE Mode

IDLE mode for the ATD module is defined as the state where the ATD

module is powered up and ready to perform an A/D conversion, but not

actually performing a conversion at the present time. Access to all

control, status, and result registers is available. The module is

consuming near maximum power.

NOTE: When not active, the sample-and-hold and analog-to-digital sub-

modules disable the clocks at their inputs to conserve power. The analog

electronics still draw quiescent current.

18.5.3 RUN Mode

RUN mode for the ATD module is defined as the state where the ATD

module is powered up and currently performing an A/D conversion.

Complete assess to all control, status and result registers is available.

The module is consuming maximum power.

18.6 ATD Operation In Different MCU Modes

18.6.1 STOP Mode

Asserting Stop causes the ATD module to power down. The digital clocks

are disabled and the analog quiescent current draw is turned off; this

places the module into its power down state and is equivalent to clearing

the ADPU control bit in ATDCTL2.

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