ST6253C View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST6253C

8-bit MCUs with A/D converter, safe reset, auto-reload timer, EEPROM and SPI

STMicroelectronics 

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ST6253C ST6263C ST6263B ST6260C ST6260B

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 4ST62E60C/T60C 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 STMicroelectronics,

to gain access to the OTP contents. Returned

parts with a protection set can therefore not be ac-

cepted.

Figure 5ST62T53C/T63C Program

Memory Map

0000h

RESERVED*

USER

PROGRAM MEMORY

(OTP/EPROM)

3872 BYTES

087Fh

0880h

USER

PROGRAM MEMORY

(OTP)

1824 BYTES

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

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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