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ST6255CN1 Datasheet(PDF) 8 Page - STMicroelectronics |
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ST6255CN1 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 86 page 8/86 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 8 |
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