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module clock enabled through PCC CGC bit, there will not be
any transfer error termination.
3.4.1 Read-after-write sequence and required serialization of
memory operations
In some situations, a write to a peripheral must be completed fully before a subsequent
action can occur. Examples of such situations include:
• Exiting an interrupt service routine (ISR)
• Changing a mode
• Configuring a function
In these situations, the application software must perform a read-after-write sequence to
guarantee the required serialization of the memory operations, as shown in the following
table.
Table 3-2. Read-after-write sequence to guarantee required serialization of memory
operations
Step
Action
1
Write the peripheral register.
2
Read the written peripheral register to verify the write.
3
Continue with subsequent operations.
NOTE
One factor contributing to these situations is processor write
buffering. The processor architecture has a programmable
configuration field to disable write buffering:
ACTLR[DISDEFWBUF]. (For details see Arm® Cortex® M4
Processor Technical Reference Manual, Revision r0p1, at
). However, disabling buffered writes is likely to
degrade system performance much more than simply
performing the required memory serialization for the situations
that truly require it.
Chapter 3 Memory Map
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
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