NXP Semiconductors MPC5644A, Reference Manual, Page: 232 / 1735

Flash memory
MPC5644A Microcontroller Reference Manual, Rev. 6
232 Freescale Semiconductor
12.3.2.6 High-Address Space Block Select Register (HSR)
The High-Address Space Block Select Register (HSR) provides a means to select blocks to be operated on
during erase.
Offset 0x0010 Access: User read/write
R
0 0 0 0 0 0 0 0 0 0 0 0 0 0 MSEL
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
R
0 0 0 0 0 0 LSEL
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
= Unimplemented or Reserved
Figure 12-7. Low/Mid-Address Space Block Select Register (LMSR)
Table 12-9. LMSR field descriptions
Field Description
MSEL[1:0] Mid-Address Space Block Select
A value of 1 in the select register signifies that the block is selected for erase. A value of 0 in the select
register signifies that the block is not selected. The reset value for the select registers is 0, or unselected.
The blocks must be selected (or unselected) before doing an erase interlock write as part of the erase
sequence. The select register is not writable once an interlock write is completed until MCR[DONE] is
set at the completion of the requested operation, or if a high voltage operation is suspended. MSEL is
also not writable during UTest operations, when AIE is high.
In the event that blocks are not present (due to configuration or total memory size), the corresponding
select bits default to unselected, and are not writable. The reset value is always 0, and register writes
have no effect.
LSEL[9:0] Low-Address Space Block Select
A value of 1 in the select register signifies that the block is selected for erase. A value of 0 in the select
register signifies that the block is not selected. The reset value for the select registers is 0, or unselected.
The blocks must be selected (or unselected) before doing an erase interlock write as part of the erase
sequence. The select register is not writable once an interlock write is completed until MCR[DONE] is
set at the completion of the requested operation, or if a high voltage operation is suspended. LSEL is
also not writable during UTest operations, when AIE is high.
In the event that blocks are not present (due to configuration or total memory size), the corresponding
select bits default to unselected, and are not writable. The reset value is always 0, and register writes
have no effect.