ST6262BB1 datasheet(7/68 Pages) STMICROELECTRONICS

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ST62T52B ST62T62B/E62B

MEMORY MAP (Cont’d)

1.3.2 Program Space

Program Space comprises the instructions to be

executed, the data required for immediate ad-

dressing mode instructions, the reserved factory

test area and the user vectors. Program Space is

addressed via the 12-bit Program Counter register

(PC register).

1.3.2.1 Program Memory Protection

The Program Memory in OTP or EPROM devices

can be protected against external readout of

memory by selecting the READOUT PROTEC-

TION option in the option byte.

In the EPROM parts, READOUT PROTECTION

option can be disactivated only by U.V. erasure

that also results into the whole EPROM context

erasure.

Note: Once the Readout Protection is activated, it

is no longer possible, even for SGS-THOMSON,

to gain access to the OTP contents. Returned

parts with a protection set can therefore not be ac-

cepted.

Figure 4. ST62T52B/T62B Program

Memory Map

0000h

RESERVED*

USER

PROGRAM MEMORY

(OTP/EPROM)

1836 BYTES

0F9Fh

0FA0h

0FEFh

0FF0h

0FF7h

0FF8h

0FFBh

0FFCh

0FFDh

0FFEh

0FFFh

RESERVED*

RESERVED

INTERRUPT VECTORS

NMI VECTOR

USER RESET VECTOR

(*) Reserved areas should be filled with 0FFh

0880h

087Fh

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