Information

Table 41-3. Module modes and their conditions
Module mode Description Conditions when used
Enabled The module performs the charger
detection sequence.
System software should enable the module only when all of the
following conditions are true:
• The system uses a rechargeable battery.
• The device is being used in an FS USB device application.
• The device has detected that it is attached to the USB cable.
Disabled The module is not active and is held
in a low power state.
System software should disable the module when either of the
following conditions is true:
• The charger detect sequence is complete.
• The conditions for being enabled are not met.
Powered Off The digital supply voltage dvdd is
removed.
Low system performance requirements allow putting the device into
a very low-power stop mode.
Operating mode transitions are shown in the following table.
Table 41-4. Entering and exiting module modes
Module
mode
Entering Exiting
Mode
after
exiting
Enabled Set CONTROL[START]. Set CONTROL[SR].
1
Disabled
Disabled Take either of the following actions:
• Set CONTROL[SR].
1
• Reset the module. By default, the module
is disabled.
Set CONTROL[START]. Enabled
Powered
Off
Perform the following actions:
1. Put the device into very low-power stop
mode.
2. Adjust the supply voltages.
Perform the following actions:
1. Restore the supply voltages.
2. Take the device out of very low-power stop
mode.
Disabled
1. The effect of setting the SR bit is immediate; that is, the module is disabled even if the sequence has not completed.
41.3 Module signal descriptions
This section describes the module signals. The following table shows a summary of
module signals that interface with the pins of the device.
Module signal descriptions
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
928 Freescale Semiconductor, Inc.