PXD10RM Datasheet, PDF (569/1332 Pages) Freescale Semiconductor, Inc – PXD10 Microcontroller

The NVHBL register is a 64-bit register, the 32 most significative bits of which (bits 63-32) are ‘don’t care’
and eventually used to manage ECC codes.
Table 17-14. HBL field descriptions
Field
Description
0
1:25
26:31
High address space Block Enable (Read Only)
This bit is used to enable the Lock registers (HLK5-0) to be set or cleared by registers writes.
This bit is a status bit only. The method to set this bit is to write a password, and if the password matches,
the HBE bit will be set to reflect the status of enabled, and is enabled until a reset operation occurs. For
HBE the password 0xB2B22222 must be written to the HBL register.
0: High Address Locks are disabled: HLK5-0 cannot be written.
1: High Address Locks are enabled: HLK5-0 can be written.
Reserved (Read Only).
Write these bits has no effect and read these bits always outputs 0.
HLK5-0: High address space block LocK 5-0 (Read/Write)
These bits are used to lock the blocks of High Address Space from Program and Erase.
All the HLK5-0 are not used for both Code Flash 0 and 1 that are all mapped in mid and low address
space.
A value of 1 in a bit of the HLK register signifies that the corresponding block is locked for Program and
Erase.
A value of 0 in a bit of the HLK register signifies that the corresponding block is available to receive
Program and Erase pulses.The HLK register is not writable once an interlock write is completed until
MCR.DONE is set at the completion of the requested operation. Likewise, the HLK register is not writable
if a high voltage operation is suspended.
Upon reset, information from the Test Flash block is loaded into the HLK registers. The HLK bits may be
written as a register. Reset will cause the bits to go back to their Test Flash block value. The default value
of the HLK bits (assuming erased fuses) would be locked.
In the event that blocks are not present (due to configuration or total memory size), the HLK bits will default
to locked, and will not be writable. The reset value will always be 1 (independent of the Test Flash block),
and register writes will have no effect.
In both Code Flash 0 and 1, bits HLK5-0 are read-only and locked at 1.
HLK is not writable unless HBE is high.
0: High Address Space Block is unlocked and can be modified.
1: High Address Space Block is locked and cannot be modified.
17.2.6.6 Secondary Low/mid address space block Locking register (SLL)
Address Offset: 0x000C
Reset value: 0x00XXXXXX, initially determined by NVSLL, located in test sector.
Freescale Semiconductor
PXD10 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
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