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ST62T40B Datasheet(PDF) 8 Page - STMicroelectronics |
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ST62T40B Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 76 page 8/76 ST62T40B/E40B 1.3 MEMORY MAP 1.3.1 Introduction The MCU operates in three separate memory spaces: Program space, Data space, and Stack space. Operation in these three memory spaces is described in the following paragraphs. Briefly, Program space contains user program code in Program memory and user vectors; Data space contains user data in RAM and in Program memory, and Stack space accommodates six lev- els of stack for subroutine and interrupt service routine nesting. 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). Program Space is organised in four 2K pages. Three of them are addressed in the 000h-7FFh lo- cations of the Program Space by the Program Counter and by writing the appropriate code in the Program ROM Page Register (PRPR register). A common (STATIC) 2K page is available all the time for interrupt vectors and common subrou- tines, independently of the PRPR register content. This “STATIC” page is directly addressed in the 0800h-0FFFh by the MSB of the Program Counter register PC 11. Note this page can also be ad- dressed in the 000-7FFh range. It is two different ways of addressing the same physical memory. Jump from a dynamic page to another dynamic page is achieved by jumping back to the static page, changing contents of PRPR and then jump- ing to the new dynamic page. Figure 3. 8Kbytes Program Space Addressing Figure 4. Memory Addressing Diagram PC SPACE 000h 7FFh 800h FFFh 0000h 1FFFh Page 0 Page 1 Static Page Page 2 Page 3 Page 1 Static Page ROM SPACE PROGRAM SPACE PROGRAM INTERRUPT & RESET VECTORS ACCUMULATOR DATA RAM BANK SELECT WINDOW SELECT RAM X REGISTER Y REGISTER V REGISTER W REGISTER DATA READ-ONLY WINDOW RAM / EEPROM BANKING AREA 000h 03Fh 040h 07Fh 080h 081h 082h 083h 084h 0C0h 0FFh 0-63 DATA SPACE 0000h 0FF0h 0FFFh MEMORY MEMORY DATA READ-ONLY MEMORY VR01568 580 |
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