MC9S12T64 Datasheet, PDF (202/608 Pages) Motorola, Inc – Specification

Freescale Semiconductor, Inc.
Flash EEPROM 64K
Flash Protection
Option Fields
Security information that allows the MCU to prevent intrusive access to
the Flash module is stored in the Flash block’s Flash Protection/Options
field. A description of the 16 bytes used in this field is given in Table 37.
Table 37 Flash Protection/Security Field
Address
Size
Description
$FF00–$FF07
$FF08–$FF0B
$FF0C
$FF0D
$FF0E
$FF0F
8
Backdoor comparison key
4
Reserved
Protection byte for Flash block 1
1
(The byte is loaded into FPROT banked
register during reset)
Protection byte for Flash block 0
1
(The byte is loaded into FPROT banked
register during reset)
1
Reserved
Security Byte
1
(The byte is loaded into FSEC register during
reset)
The Flash module has hardware interlocks which protect data from
accidental corruption by sectors as shown in Table 38. Flash block 0 has
a protected sector located at the higher address end, just below $FFFF,
and another protected sector located at the lower address end, starting
at address $8000. Flash block 1 has a protected sector located at the
higher address end, just below $7FFF, and another protected sector
located at the lower address end, starting at address $0000.The high
address protected sectors in each Flash block can be sized from 2K
MC9S12T64Revision 1.1.1
Flash EEPROM 64K
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