MC9S12T64 Datasheet, PDF (231/608 Pages) Motorola, Inc – Specification

Freescale Semiconductor, Inc.
Flash EEPROM 64K
Flash Security
Flash Security
The Flash module provides the necessary security information to the
rest of the chip. After each reset, the Flash module determines the
security state of the microcontroller as defined in section FSEC — Flash
Security Register in page 208.
The contents of the Flash Protection/Options byte at $FF0F in the Flash
Protection/Options Field must be changed directly by programming
$FF0F when the device is unsecured and the higher address sector is
unprotected. If the Flash Protection/Options byte is left in the secure
state, any reset will cause the microcontroller to return to the secure
operating mode
Reset Initialization
Out of reset the module holds core activity while the Protection and
Security registers are loaded from Flash 0. Thereafter, the Flash module
is immediately accessible, operating in read mode.
If a reset occurs while any command is in progress that command will be
immediately aborted. The state of the word being programmed or the
sector / block being erased is not guaranteed.
Flash EEPROM 64K
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MC9S12T64Revision 1.1.1