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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC312XDP512F0MPVR датащи(PDF) 626 Page - Freescale Semiconductor, Inc |
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SC312XDP512F0MPVR датащи(HTML) 626 Page - Freescale Semiconductor, Inc |
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626 / 1348 page  Chapter 17 Memory Mapping Control (S12XMMCV2) MC9S12XDP512 Data Sheet, Rev. 2.21 626 Freescale Semiconductor 17.3.2.7 EEPROM Page Index Register (EPAGE) Read: Anytime Write: Anytime The EEPROM page index register allows accessing up to 256 Kbyte of EEPROM in the global memory map by using the eight page index bits to page 1 Kbyte blocks into the EEPROM page window located in the local CPU memory map from address $0800 to address $0BFF (see Figure 1-14). CAUTION XGATE write access to this register during an CPU access which makes use of this register could lead to unexpected results. Figure 17-14. EPAGE Address Mapping The reset value of $FE ensures that there is a linear EEPROM space available between addresses $0800 and $0FFF out of reset. The fixed 1K page $0C00–$0FFF of EEPROM is equivalent to page 255 (page number $FF). Address: 0x0017 76543210 R EP7 EP6 EP5 EP4 EP3 EP2 EP1 EP0 W Reset 11111110 Figure 17-13. EEPROM Page Index Register (EPAGE) Table 17-12. EPAGE Field Descriptions Field Description 7–0 EP[7:0] EEPROM Page Index Bits 7–0 — These page index bits are used to select which of the 256 EEPROM array pages is to be accessed in the EEPROM Page Window. Bit16 Bit0 Bit9 Address [9:0] EPAGE Register [7:0] Global Address [22:0] Bit10 Bit17 0 0 1 00 Address: CPU Local Address or BDM Local Address |
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