Datasheet

Instruction Cache
4-10 MCF5206e USER’S MANUAL MOTOROLA
CM - Cache Mode
This bit defines the cache mode: 0 is cacheable, 1 is noncacheable.
0 = Caching enabled
1 = Caching disabled
BWE- Buffered Write Enable
This bit defines the value for enabling buffered writes. If BWE = 0, the termination of an
operand write cycle on the processor's local bus is delayed until the external bus cycle is
completed. If BWE = 1, the write cycle on the local bus is terminated immediately and the
operation is then buffered in the bus controller. In this mode, operand write cycles are
effectively decoupled between the processor's local bus and the external bus.
Generally, the enabling of buffered writes provides higher system performance but
recovery from access errors may be more difficult. For the ColdFire CPU, the reporting of
access errors on operand writes is always imprecise, and enabling buffered writes simply
decouples the write instruction from the signaling of the fault even more.
0 = Don’t buffer writes
1 = Buffer writes
WP - Write Protect
The WP bit defines the write-protection attribute. If the effective memory attributes for a
given access select the WP bit, an access error terminates any attempted write with this
bit set.
0 = Read and write accesses permitted
1 = Only read accesses permitted
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Freescale Semiconductor, Inc.
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