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ST6380 数据表(PDF) 10 Page - STMicroelectronics |
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ST6380 数据表(HTML) 10 Page - STMicroelectronics |
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10 / 82 page  10/82 ST6380, ST6381, ST6382, ST6383, ST6388, ST6389 MEMORY SPACES (Cont’d) Program ROM Page Register (PRPR) Address: CAh - Write only Reset Value: XXh D7-D4. These bits are not used but have to be written to “0”. PRPR3-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 4. This register is undefined on reset. Caution: This register contains at least one write only bit. Single bit instructions (SET, RES, INC and DEC) should not be used. Note. Only the lower part of address space has been bankswitched because interrupt vectors and common 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 another, 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 restore its previous content. Anyway, this opera- tion may be necessary if the sum of common rou- tines and interrupt drivers will take more than 2K bytes; in this case it could be necessary to divide the interrupt driver in a (minor) part in the static page (start and end), and in the second (major) part in one dynamic page. If it is impossible to avoid the writing of this register in interrupts driv- ers, an image of this register must be saved in a RAM location. Each time the program writes the PRPR register, the image register should also be written. 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. Program Memory Map 70 - - - - PRPR3 PRPR2 PRPR1 PRPR0 PRPR3 PRPR2 PRPR1 PRPR0 PC11 Memory Page X XXX 1 Static Page (Page 1) 0 0 0 0 0 Page 0 00 01 0 Page 1 (Static Page) 0 0 1 0 0 Page 2 0 0 1 1 0 Page 3 0 1 0 0 0 Page 4 0 1 0 1 0 Page 5 0 1 1 0 0 Page 6 0 1 1 1 0 Page 7 1 0 0 0 0 Page 8 1 0 0 1 0 Page 9 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 ST6380, 81) PAGE 4 0000h-000Fh 0010h-07FFh Reserved User ROM PAGE 5 0000h-000Fh 0010h-07FFh Reserved User ROM PAGE 6 0000h-000Fh 0010h-07FFh Reserved User ROM PAGE 7 0000h-000Fh 0010h-07FFh Reserved User ROM (End of 16K ST6382, 83) PAGE 8 0000h-000Fh 0010h-07FFh Reserved User ROM PAGE 9 0000h-000Fh 0010h-07FFh Reserved User ROM (End of 20K ST6388, 89) |
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