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PC312XDP512F0CFVR Datasheet(PDF) 664 Page - Freescale Semiconductor, Inc |
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PC312XDP512F0CFVR Datasheet(HTML) 664 Page - Freescale Semiconductor, Inc |
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664 / 1348 page  Chapter 18 Memory Mapping Control (S12XMMCV3) MC9S12XDP512 Data Sheet, Rev. 2.21 664 Freescale Semiconductor 18.3.2.6 RAM Page Index Register (RPAGE) Read: Anytime Write: Anytime These eight index bits are used to page 4 KByte blocks into the RAM page window located in the local (CPU or BDM) memory map from address 0x1000 to address 0x1FFF (see Figure 18-12). This supports accessing up to 1022 Kbytes of RAM (in the Global map) within the 64 KByte Local map. The RAM page index register is effectively used to construct paged RAM addresses in the Local map format. CAUTION XGATE write access to this register during an CPU access which makes use of this register could lead to unexpected results. Table 18-11. Data Sources when CPU or BDM is Accessing Flash Area Chip Modes ROMON EROMON DATA SOURCE1 1 Internal Flash means Flash resources inside the MCU are read/written. Emulation memory means resources inside the emulator are read/written (PRU registers, flash replacement, RAM, EEPROM and register space are always considered internal). External application means resources residing outside the MCU are read/written. Stretch2 2 The external access stretch mechanism is part of the EBI module (refer to EBI Block Guide for details). Normal Single Chip X X Internal Flash N Special Single Chip Emulation Single Chip X 0 Emulation Memory N X 1 Internal Flash Normal Expanded 0 X External Application Y 1 X Internal Flash N Emulation Expanded 0 X External Application Y 1 0 Emulation Memory N 1 1 Internal Flash Special Test 0 X External Application N 1 X Internal Flash Address: 0x0016 76543210 R RP7 RP6 RP5 RP4 RP3 RP2 RP1 RP0 W Reset 11111101 Figure 18-11. RAM Page Index Register (RPAGE) |
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