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ST62E25BT3 Fiches technique(PDF) 11 Page - STMicroelectronics |
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ST62E25BT3 Fiches technique(HTML) 11 Page - STMicroelectronics |
11 / 105 page ST6215C ST6225C 11/105 MEMORY MAP (Cont’d) 3.1.2 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). Thus, the MCU is capable of ad- dressing 4K bytes of memory directly. 3.1.3 Readout Protection The Program Memory in OTP or EPROM devices can be protected against external readout of mem- ory by setting the Readout Protection bit in the op- tion byte (Section 3.3 on page 16). In the EPROM parts, Readout Protection option can be desactivated only by U.V. erasure that also results in the whole EPROM context being erased. Note: Once the Readout Protection is activated, it is no longer possible, even for STMicroelectronics, to gain access to the OTP contents. Returned parts can therefore not be accepted if the Readout Protection bit is set. 3.1.4 Data Space Data Space accommodates all the data necessary for processing the user program. This space com- prises the RAM resource, the processor core and peripheral registers, as well as read-only data such as constants and look-up tables in OTP/ EPROM. 3.1.4.1 Data ROM All read-only data is physically stored in program memory, which also accommodates the Program Space. The program memory consequently con- tains the program code to be executed, as well as the constants and look-up tables required by the application. The Data Space locations in which the different constants and look-up tables are addressed by the processor core may be thought of as a 64-byte window through which it is possible to access the read-only data stored in OTP/EPROM. 3.1.4.2 Data RAM The data space includes the user RAM area, the accumulator (A), the indirect registers (X), (Y), the short direct registers (V), (W), the I/O port regis- ters, the peripheral data and control registers, the interrupt option register and the Data ROM Win- dow register (DRWR register). 3.1.5 Stack Space Stack space consists of six 12-bit registers which are used to stack subroutine and interrupt return addresses, as well as the current program counter contents. 1 |
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