NXP Semiconductors MPC5644A, Reference Manual, Page: 231 / 1735

Flash memory
MPC5644A Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor 231
12.3.2.5 Low/Mid-Address Space Block Select Register (LMSR)
The Low/Mid-Address Space Block Select Register (LMSR) provides a means to select blocks to be
operated on during erase.
Offset 0x000C Access: User read/write
R
SLE 0 0 0 0 0 0 0 0 0 0
SSL
OCK
0 0 SMLOCK
W
Reset
0 0 0 0 0 0 0 0 0 0 0 1* 0 0 1* 1*
R
0 0 0 0 0 0 SLLOCK
W
Reset
0 0 0 0 0 0 1* 1* 1* 1* 1* 1* 1* 1* 1* 1*
= Unimplemented or Reserved
Figure 12-6. Secondary Low/Mid-Address Space Block Lock Register (SLMLR)
Table 12-8. SLMLR field descriptions
Field Description
SLE Secondary Low/Mid-Address Lock Enable
The SLE bit is used to enable the Lock fields (SSLOCK, SMLOCK, and SLLOCK) to be set or cleared
by register writes. SLE is a status bit only, and may not be written or cleared, and the reset value is
0. The method to set SLE is to provide a password, and if the password matches, SLE is set to
reflect the status of enabled, and is enabled until a reset operation occurs. For SLE, the password
0xC3C3_3333 must be written to the SLMLR.
0: Secondary Low/Mid-Address Locks are disabled, and can not be modified.
1: Secondary Low/Mid-Address Locks are enabled to be written.
SSLOCK Secondary Shadow Lock
The SSLOCK bit is an alternative method that may be used to lock the shadow block from programs
and erases. SSLOCK has the same description as SLOCK. SSLOCK is not writable unless SLE is
high.
SMLOCK[1:0] Secondary Mid-Address Block Lock
The SMLOCK field is an alternative method that may be used to lock the Mid-Address Space blocks
from programs and erases. SMLOCK has the same description as MLOCK. SMLOCK is not writable
unless SLE is high.
SLLOCK[9:0] Secondary Low-Address Block Lock
The SLLOCK field is an alternative method that may be used to lock the Low-Address Space blocks
from programs and erases. SLLOCK has the same description as LLOCK. SLLOCK is not writable
unless SLE is high.