Stop Mode - Motorola ColdFire MCF5281 User Manual

CFM Operation
6.4.3.4 Flash User Mode Illegal Operations
The ACCERR flag will be set during a command write sequence if any of the illegal
operations below are performed. Such operations will cause the command sequence to
immediately abort.
1. Writing to the CFM array before initializing CFMCLKD.
2. Writing to the CFM array while in emulation mode.
3. Writing a byte or a word to the CFM array. Only 32-bit longword programming is
allowed.
4. Writing to the CFM array while CBEIF is not set.
5. Writing an invalid user command to the CFMCMD.
6. Writing to any CFM other than CFMCMD after writing a longword to the CFM
array.
7. Writing a second command to CFMCMD before executing the previously written
command.
8. Writing to any CFM register other than CFMUSTAT (to clear CBEIF) after writing
to the command register.
9. Entering stop mode while a program or erase command is in progress.
10. Aborting a command sequence by writing a 0 to CBEIF after the longword write to
the CFM array or after writing a command to CFMCMD and before launching it.
The PVIOL flag will be set during a command write sequence after the longword write to
the CFM array if any of the illegal operations below are performed. Such operations will
cause the command sequence to immediately abort.
1. Writing to an address in a protected area of the CFM array.
2. Writing a mass erase command to CFMCMD while any logical sector is protected
(see Section 6.3.4.4, "CFM Protection Register (CFMPROT)").
If a Flash physical block is read during a program or erase operation on that block
(CFMUSTAT bit CCIF = 0), the read will return non-valid data and the ACCERR flag will
not be set.
6.4.4

Stop Mode

If a command is active (CCIF = 0) when the MCU enters stop mode, the command
sequence monitor performs the following:
1. The command in progress aborts
2. The Flash high voltage circuitry switches off and any pending command
(CBEIF = 0) does not executed when the MCU exits stop mode.
6-22 MCF5282 User's Manual MOTOROLA