ST6253B データシートの表示（PDF） - STMicroelectronics

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ST6253B

8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, AUTO-RELOAD TIMER, EEPROM AND SPI

STMicroelectronics 

ST62T53B/T60B/T63B ST62E60B

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 mem-

ory by selecting the READOUT PROTECTION op-

tion in the option byte.

Figure 4. ST62E60B/T60B Program

Memory Map

0000h

007Fh

0080h

RESERVED*

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 5. ST62T53B/T63B Program

Memory Map

0000h

RESERVED*

USER

PROGRAM MEMORY

(O TP/EPRO M)

3872 BYTES

087Fh

0880h

USER

PROGRAM MEMORY

(OT P)

1824 BYTES

0F9Fh

0FA0h

0FEFh

0FF0h

0FF7h

0FF8h

0FF Bh

0FFCh

0FFDh

0FF Eh

0FFF h

RESERVED*

INTERRUPT VECTORS

RESERVED

NMI VECTOR

USER RESET VECTOR

(*) Reserved areas should be filled with 0FFh

0F9Fh

0FA0h

0FEFh

0FF0h

0FF7h

0FF8h

0FFBh

0FFCh

0FFDh

0FFEh

0FFFh

RESERVED*

INTERRUPT VECTORS

RESERVED

NMI VECTOR

USER RESET VECTOR

(*) Reserved areas should be filled with 0FFh

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