MMC2107 - Freescale Semiconductor

Freescale Semiconductor, Inc.
Non-Volatile Memory FLASH (CMFR)
Registers and Memory Map
FSTOP — FLASH Stop Enable Bit
The read-always FSTOP bit causes the CMFR to enter a low-power
stop mode. Writing has no effect if SES = 1. When FSTOP is set, the
BIU continues to operate to allow accesses to CMFRMCR. Accesses
to other registers are terminated with bus error. Accesses to the array
are ignored. To prevent unpredictable behavior, change the FSTOP
bit in a separate write operation.
1 = CMFR in low-power stop mode
0 = CMFR in normal mode
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FDBG — FLASH Debug Enable Bit
The read/write FDBG bit determines whether the set-once LOCKCTL
bit is writable when the chip is in debug mode. Writing to the FDBG bit
must occur before the LOCKCTL bit is writable.
1 = Debug mode enabled
0 = Debug mode disabled
EME — Emulation Enable Bit
The read-always EME bit enables the CMFR to enter emulation
mode. EME is writable when the LOCKCTL and DIS bits are set.
During emulation mode the CMFR terminates array access cycles,
but does not drive data. Array data can be emulated by reading an
external memory, and on-page/off-page timing is the same as in
non-emulation mode. Note that write accesses to the array space are
the same as normal mode.
1 = Emulation mode enabled
0 = Emulation mode disabled
For more information about emulation operation see 9.8.7 Emulation
Operation.
SIE — Shadow Information Enable Bit
The read-always SIE bit selects the shadow information row. SIE is
write-protected when the ERASE bit is clear and the SES bit is set.
When SIE is set and an array location is read using supervisor data,
the shadow information is read from a location determined by the
column, 32 byte read page select, and word addresses of the access.
Accessing the control block registers accesses the registers and not
the shadow information.
1 = Shadow information enabled; normal array access disabled
0 = Shadow information disabled; normal array access enabled
MMC2107 – Rev. 2.0
Technical Data
MOTOROLA Non-Volatile Memory FLASH (CMFR) 189
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