st62t62b STMicroelectronics, st62t62b Datasheet - Page 7

• Manufacturer Part Number: st62t62b
• Description: 8-bit Otp/eprom Mcus With A/d Converter, Auto-reload Timer And Eeprom
• Manufacturer: STMicroelectronics

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
(*) Reserved areas should be filled with 0FFh
0FEFh
0FFBh
0FFCh
0FFDh
0FFEh
0F9Fh
0FA0h
0FF0h
0FF7h
0FF8h
0FFFh
0000h
087Fh
0880h
Memory Map
INTERRUPT VECTORS
USER RESET VECTOR
PROGRAM MEMORY
ST62T52B ST62T62B/E62B
(OTP/EPROM)
NMI VECTOR
RESERVED
1836 BYTES
RESERVED
RESERVED
USER
*
*
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