ST62T46B datasheet(9/72 Pages) STMICROELECTRONICS

Il numero della parte	ST62T46B

Spiegazioni elettronici	8-BIT OTP/EPROM MCU WITH LCD DRIVER, EEPROM AND A/D CONVERTER

PDF	72 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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ST62T46B/E46B

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.

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 Program memory contents.

Returned parts with a protection set can therefore

not be accepted.

Figure 4. ST62E46B/T46B Program

Memory Map

0000h

RESERVED*

USER

PROGRAM MEMORY

(OTP/EPROM)

3872 BYTES

0F9Fh

0FA0h

0FEFh

0FF0h

0FF7h

0FF8h

0FFBh

0FFCh

0FFDh

0FFEh

0FFFh

RESERVED*

RESERVED

INTERRUPT VECTORS

NMI VECTOR

USER RESET VECTOR

0080h

(*) Reserved areas should be filled with 0FFh

007Fh

345

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