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Chapter 28 Analog-to-Digital Converter (ADC)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
729
Signals Delay register (DSDR) is provided. The delay between the decoding signal selection and the actual
start of conversion can be programmed by writing the field DSD[0:11].
After having selected the channel to be converted, the MA[0:2] control lines are automatically reset. For
instance, in the event of normal scan conversion on ANP[0] followed by ANX[0,7] (ADC ch 71) all the
MA[0:2] bits are set and subsequently reset.
28.3.10 Power-down mode
The analog part of the ADC can be put in low power mode by setting the MCR[PWDN]. After releasing
the reset signal the ADC analog module is kept in power-down mode by default, so this state must be exited
before starting any operation by resetting the appropriate bit in the MCR.
The power-down mode can be requested at any time by setting the MCR[PWDN]. If a conversion is
ongoing, the ADC must complete the conversion before entering the power down mode. In fact, the ADC
enters power-down mode only after completing the ongoing conversion. Otherwise, the ongoing operation
should be aborted manually by resetting the NSTART bit and using the ABORTCHAIN bit.
MSR[ADCSTATUS] bit is set only when ADC enters power-down mode.
After the power-down phase is completed the process ongoing before the power-down phase must be
restarted manually by setting the appropriate MCR[START] bit.
Resetting MCR[PWDN] bit and setting MCR[NSTART] or MCR[JSTART] bit during the same cycle is
forbidden.
If a CTU trigger pulse is received during power-down, it is discarded.
If the CTU is enabled and the CSR[CTUSTART] bit is 1, then the MCR[PWDN] bit cannot be set.
When CTU trigger mode is enabled, the application has to wait for the end of conversion (CTUSTART bit
automatically reset).
28.3.11 Auto-clock-off mode
To reduce power consumption during the IDLE mode of operation (without going into power-down mode),
an auto-clock-off feature can be enabled by setting the MCR[ACKO] bit. When enabled, the analog clock
is automatically switched off when no operation is ongoing, that is, no conversion is programmed by the
user.
NOTE
The auto-clock-off feature cannot operate when the digital interface runs at
the same rate as the analog interface. This means that when
MCR.ADCCLKSEL = 1, the analog clock will not shut down in IDLE
mode.
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