mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 992

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Module Signal Description
Operating mode transitions are shown in the following table.
1. The effect of setting the SR bit is immediate; that is, the module is disabled even if the sequence has not completed.
40.3 Module Signal Description
This section describes the module signals.
992
Enabled
Disabled
Powered Off
Enabled
Disabled
Powered
Off
Module Mode
Module
Mode
Set the CONTROL[START] bit.
Take either of the following actions:
Perform the following actions:
Entering
1. Put the device into very low-power stop
2. Adjust the supply voltages.
• Set the CONTROL[SR] bit.
• Reset the module. (The module is disabled
out of reset by default.)
mode.
The module performs the charger
detection sequence.
The module is not active and is held
in a low power state.
The digital supply voltage dvdd is
removed.
Optionally, the analog supply
voltage avdd33 also may be
reduced to as low as 1.7v without
causing excess leakage.
Description
Table 40-3. Module Modes and Their Conditions
Table 40-4. Entering and Exiting Module Modes
MCF51JF128 Reference Manual, Rev. 2, 03/2011
1
Preliminary
System software should enable the module only when all of the
following conditions are true:
System software should disable the module when either of the
following conditions is true:
Low system performance requirements allow putting the device into
a very low-power stop mode.
Conditions When Used
• 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.
• The charger detect sequence is complete.
• The conditions for being enabled are not met.
Set the CONTROL[SR] bit.
Set the CONTROL[START] bit.
Perform the following actions:
Exiting
1. Restore the supply voltages.
2. Take the device out of very low-power stop
mode.
1
Freescale Semiconductor, Inc.
Disabled
Enabled
Disabled
Mode
after
Exiting