PXD10RM Datasheet, PDF (564/1332 Pages) Freescale Semiconductor, Inc – PXD10 Microcontroller

Table 17-8. MCR field descriptions (continued)
Field
Description
29 ERS: ERaSe (Read/Write)
ERS is used to setup the Flash Module for an Erase operation.
A 0 to 1 transition of ERS initiates an Erase sequence.
A 1 to 0 transition of ERS ends the Erase sequence.
ERS can be set only under User Mode Read (PGM is low and UT0.AIE is low).
ERS can be cleared by the user only when ESUS and EHV are low and DONE is high.
ERS is cleared on reset.
0: Flash is not executing an Erase sequence.
1: Flash is executing an Erase sequence.
30 ESUS: Erase SUSpend (Read/Write)
ESUS is used to indicate that the Flash Module is in Erase Suspend or in the process of entering a
Suspend state. The Flash Module is in Erase Suspend when ESUS=1 and DONE=1.
ESUS can be set high only when ERS and EHV are high and PGM is low.
A 0 to 1 transition of ESUS starts the sequence which sets DONE and places the Flash in Erase Suspend.
The Flash Module enters Suspend within t_ESUS of this transition.
ESUS can be cleared only when DONE and EHV are high and PGM is low.
A 1 to 0 transition of ESUS with EHV=1 starts the sequence which clears DONE and returns the Module
to Erase.
The Flash Module cannot exit Erase Suspend and clear DONE while EHV is low.
ESUS is cleared on reset.
0: Erase sequence is not suspended.
1: Erase sequence is suspended.
31 EHV: Enable High Voltage (Read/Write)
The EHV bit enables the Flash Module for a high voltage Program/Erase operation.
EHV is cleared on reset.
EHV must be set after an interlock write to start a Program/Erase sequence. EHV may be set under one
of the following conditions:
Erase (ERS=1, ESUS=0, UT0.AIE=0)
Program (ERS=0, ESUS=0, PGM=1, UT0.AIE=0)
In normal operation, a 1 to 0 transition of EHV with DONE high and ESUS low terminates the current
Program/Erase high voltage operation.
When an operation is aborted, there is a 1 to 0 transition of EHV with DONE low and the eventual
Suspend bit low. An abort causes the value of PEG to be cleared, indicating a failing Program/Erase;
address locations being operated on by the aborted operation contain indeterminate data after an abort.
A suspended operation cannot be aborted.
Aborting a high voltage operation will leave the Flash Module addresses in an undeterminate data state.
This may be recovered by executing an Erase on the affected blocks.
EHV may be written during Suspend. EHV must be high to exit Suspend. EHV may not be written after
ESUS is set and before DONE transitions high. EHV may not be cleared after ESUS is cleared and before
DONE transitions low.
0: Flash is not enabled to perform an high voltage operation.
1: Flash is enabled to perform an high voltage operation.
SIZE2-0
000
001
010
Table 17-9. Array Space Size
Array Space Size
128KB
256KB
512KB
17-14
PXD10 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor