Flash MemoryMPC5606S Microcontroller Reference Manual, Rev. 7Freescale Semiconductor 553damage to the high voltage circuits. Reset aborts all operations and forces the flash module into User modeready to receive accesses. Reset and power-off must not be used systematically to terminate a program orerase operation.After reset is negated, read register access may be done, although it should be noted that registers thatrequire updating from shadow information, or other inputs, may not read updated values untilMCR.DONE transitions. MCR.DONE may be polled to determine if the flash module has transitioned outof reset. Notice that the registers cannot be written until MCR.DONE is high.17.2.5.2 Power-Down modeThe Power-Down mode turns off all flash memory DC current sources, so that power dissipation is dueonly to leakage.In Power-Down mode, no reads from or write to the module are possible.The user may not read some registers (UMISR0–4, UT1–2 and part of UT0) until the Power-Down modeis exited. On the contrary, write access is locked on all the registers in Power-Down mode.When enabled, the flash memory module returns to its previous state in all cases unless it was in theprocess of executing an erase high voltage operation at the time of entering Power-Down mode.If the flash memory module enters Power-Down mode during an erase operation, the MCR[ESUS] bit isset. The user may resume the erase operation when the module exits Power-Down mode by clearing theMCR[ESUS] bit. MCR[EHV] must be high to resume the erase operation.If the flash memory module is configured to enter Power-Down mode during a program operation, theoperation will be completed and the Power-Down mode will be entered only after the programming ends.If the flash memory module is put in Power-Down mode and the Vector Table remains mapped in the flashmemory address space, the user must take care that the flash memory module will strongly increase theinterrupt response time by adding several wait states.It is forbidden to enter Low-Power mode when the Power-Down mode is active.17.2.5.3 Low-Power modeThe Low-Power mode turns off most of the DC current sources within the flash module.The module (flash core and registers) is not accessible for read or write after entering Low-Power mode.The wakeup time from Low-Power mode is faster than the wakeup time from Power-Down mode.The user may not read some registers (UMISR0-4, UT1-2 and part of UT0) until the Low-Power mode isexited. Write access is locked on all the registers in Low-Power mode.When exiting from Low-Power mode the flash memory module returns to its previous state in all casesunless it was in the process of executing an erase high-voltage operation at the time of entering Low-Powermode.
