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ST6373J3B1 データシート(PDF) 9 Page - STMicroelectronics |
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ST6373J3B1 データシート(HTML) 9 Page - STMicroelectronics |
9 / 64 page ST6373 9/64 MEMORY SPACES (Cont’d) Program ROM Page Register (PRPR) Address: CAh - Write only Reset Value: XXh D7-D3. These bits are not used but have to be written to “0”. PRPR2-PRPR0. These are the program ROM banking bits and the value loaded selects the cor- responding page to be addressed in the lower part of 4K program address space as specified in Table 3.This register is undefined on reset. Note: Only the lower part of address space has been bankswitched because interrupt vectors and com- mon subroutines should be available all the time. The reason of this structure is due to the fact that it is not possible to jump from a dynamic page to an- other, unless jumping back to the static page, changing contents of PRPR, and, then, jumping to a different dynamic page. Care is required when handling the PRPR as it is write only. For this reason, it is not allowed to change the PRPR contents while executing inter- rupts drivers, as the driver cannot save and than re- store its previous content. Anyway, this operation may be necessary if the sum of common routines and interrupt drivers will take more than 2K bytes; in this case could be necessary to divide the inter- rupt driver in a (minor) part in the static page (start and end), and in the second (major) part in one dy- namic page. If it is impossible to avoid the writing of this register in interrupts drivers, an image of this register must be saved in a RAM location, and each time the program writes the PRPR bit writes also the image register. The image register must be written first, so if an interrupt occurs between the two instructions the PRPR is not affected. Table 3. Program Memory Page Register Coding Table 4. ST6373 Program Memory Map Note *): all reserved areas must be set to FFh in the ROM code. 70 - - - - - PRPR2 PRPR1 PRPR0 PRPR2 PRPR1 PRPR0 PC11 Memory Page X X X 1 Static Page (Page 1) 000 0 Page 0 0 0 1 0 Page 1 (Static Page) 010 0 Page 2 011 0 Page 3 100 0 Page 4 101 0 Page 5 110 0 Page 6 111 0 Page 7 Program Memory Page Device Address Description*) PAGE 0 0000h-007Fh 0080h-07FFh Reserved User ROM PAGE 1 “STATIC” 0800h-0F9Fh 0FA0h-0FEFh 0FF0h-0FF7h 0FF8h-0FFBh 0FFCh-0FFDh 0FFEh-0FFFh User ROM Reserved Interrupt Vectors Reserved NMI Vector Reset Vector PAGE 2 0000h-000Fh 0010h-07FFh Reserved User ROM PAGE 3 0000h-000Fh 0010h-07FFh Reserved User ROM (End of 8K) PAGE 4 0000h-000Fh 0010h-07FFh Reserved User ROM PAGE 5 0000h-000Fh 0010h-07FFh Reserved User ROM (End of 12K) PAGE 6 0000h-000Fh 0010h-07FFh Reserved User ROM PAGE 7 0000h-000Fh 0010h-07FFh Reserved User ROM (End of 16K) |
同様の部品番号 - ST6373J3B1 |
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同様の説明 - ST6373J3B1 |
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