ST6255CB3 datasheet(8/86 Pages) STMICROELECTRONICS

部件名	ST6255CB3

功能描述	8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, SAFE RESET, AUTO-RELOAD TIMER, EEPROM AND SPI

PDF	86 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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ST62T55C ST62T65C/E65C

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 OTP contents. Returned

parts with a protection set can therefore not be ac-

cepted.

Figure 4.ST62T55C/T65C/E65C Program

Memory Map

0000h

RESERVED*

USER

PROGRAM MEMORY

(OTP/E PROM)

3872 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

0080h

007Fh

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