PXD10RM Datasheet, PDF (562/1332 Pages) Freescale Semiconductor, Inc – PXD10 Microcontroller

Table 17-8. MCR field descriptions (continued)
Field
Description
9:11
12:14
15
16
17
18:19
20
LAS2-0: Low Address Space 2- (Read Only)
The value of the LAS field correspond to the configuration of the Low Address Space, according to
Table 17-10.
Reserved (Read Only)
Write these bits has no effect and read these bits always outputs 0.
MAS: Mid Address Space (Read Only)
The value of the MAS field correspond to the configuration of the Mid Address Space, according to
Table 17-11.
EER: Ecc event ERror (Read/Clear)
EER provides information on previous reads. If a ECC Double Error detection occurred, the EER bit will
be set to 1.
This bit must then be cleared, or a reset must occur before this bit will return to a 0 state. This bit may not
be set to 1 by the user.
In the event of a ECC Single Error detection and correction, this bit will not be set.
If EER is not set, or remains 0, this indicates that all previous reads (from the last reset, or clearing of
EER) were correct.
Since this bit is an error flag, it must be cleared to 0 by writing 1 to the register location. A write of 0 will
have no effect.
0: Reads are occurring normally.
1: An ECC Double Error occurred during a previous read.
RWE: Read-while-Write event Error (Read/Clear)
RWE provides information on previous reads when a Modify operation is on going. If a RWW Error occurs,
the RWE bit will be set to 1. Read-While-Write Error means that a read access to the Flash Matrix has
occurred while the FPEC was performing a Program or Erase operation or an Array Integrity Check.
This bit must then be cleared, or a reset must occur before this bit will return to a 0 state. This bit may not
be set to 1 by the user.
If RWE is not set, or remains 0, this indicates that all previous RWW reads (from the last reset, or clearing
of RWE) were correct.
Since this bit is an error flag, it must be cleared to 0 by writing 1 to the register location. A write of 0 will
have no effect.
0: Reads are occurring normally.
1: A RWW Error occurred during a previous read.
Reserved (Read Only)
Write these bits has no effect and read these bits always outputs 0.
PEAS: Program/Erase Access Space (Read Only)
PEAS is used to indicate which space is valid for Program and Erase operations: main array space or
shadow/test space.
PEAS=0 indicates that the main address space is active for all Flash Module program and erase
operations.
PEAS=1 indicates that the test or shadow address space is active for program and erase.
The value in PEAS is captured and held with the first interlock write done for Modify operations. The value
of PEAS is retained between sampling events (i.e. subsequent first interlock writes).
0: Shadow/Test address space is disabled for program/erase and main address space enabled.
1: Shadow/Test address space is enabled for program/erase and main address space disabled.
17-12
PXD10 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor