ST62T45B datasheet(9/72 Pages) STMICROELECTRONICS

9 / 72 page

9/72

ST62T45B/E45B

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 Program memory contents.

Returned parts with a protection set can therefore

not be accepted.

Figure 4. ST62E45B/T45B 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

ST62T45B Datenblatt(PDF) 9 Page - STMicroelectronics

ST62T45B Datenblatt(HTML) 9 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72

Datenblatt Download

Link URL