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XC888LM Datasheet(PDF) 33 Page - Infineon Technologies AG |
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XC888LM Datasheet(HTML) 33 Page - Infineon Technologies AG |
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33 / 144 page  XC886/888CLM Functional Description Data Sheet 26 V0.9, 2006-12 Figure 9 Address Extension by Paging In order to access a register located in a page different from the actual one, the current page must be exited. This is done by reprogramming the bit field PAGE in the page register. Only then can the desired access be performed. If an interrupt routine is initiated between the page register access and the module register access, and the interrupt needs to access a register located in another page, the current page setting can be saved, the new one programmed and the old page setting restored. This is possible with the storage fields STx (x = 0 - 3) for the save and restore action of the current page setting. By indicating which storage bit field should be used in parallel with the new page value, a single write operation can: • Save the contents of PAGE in STx before overwriting with the new value (this is done in the beginning of the interrupt routine to save the current page setting and program the new page number); or SFR0 SFR1 SFRx PAGE 0 SFR0 SFR1 SFRy PAGE 1 SFR0 SFR1 SFRz PAGE q MOD_PAGE.PAGE SFR Address (from CPU) SFR Data (to/from CPU) rw Module |
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