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ST62T45B Datenblatt(PDF) 9 Page - STMicroelectronics |
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ST62T45B Datenblatt(HTML) 9 Page - 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 8 |
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