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MC912D60PMFU8 Datasheet(PDF) 81 Page - Freescale Semiconductor, Inc |
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MC912D60PMFU8 Datasheet(HTML) 81 Page - Freescale Semiconductor, Inc |
81 / 460 page Operating Modes and Resource Mapping Internal Resource Mapping MC68HC912D60A — Rev. 3.1 Technical Data Freescale Semiconductor Operating Modes and Resource Mapping 81 5.5.4 Miscellaneous System Control Register Additional mapping and external resource controls are available. To use external resources the part must be operated in one of the expanded modes. Normal modes: write once; Special modes: write anytime. Read anytime. MAPROM — Map Location of ROM This bit is used to swap the location of the on-chip Flash EEPROM. 0 = 28K byte array is mapped from $1000 to $7FFF, 32K byte array is mapped from $8000 to $FFFF. 1 = 28K byte is mapped from $9000 to $FFFF, 32K byte array is mapped from $0000 to $7FFF. NDRF — Narrow Data Bus for Register-Following Map Space This bit enables a narrow bus feature for the 512 byte Register- Following Map. This is useful for accessing 8-bit peripherals and allows 8-bit and 16-bit external memory devices to be mixed in a system. In Expanded Narrow (eight bit) modes, Single Chip Modes, and Peripheral mode, this bit has no effect. 0 = Makes Register-Following MAP space act as a full 16 bit data bus. 1 = Makes the Register-Following MAP space act the same as an 8 bit only external data bus (data only goes through port A externally). The Register-Following space is mapped from $0200 to $03FF after reset, which is next to the register map. If the registers are moved this space follows. Bit 7 6 54 32 1 Bit 0 MAPROM NDRF RFSTR1 RFSTR0 EXSTR1 EXSTR0 ROMON28 ROMON32 RESET: 0 0 0 0 1 1 0 0 Exp Modes RESET: 0 0 0 0 1 1 1 1 SC Modes MISC — Miscellaneous Mapping Control Register $0013 |
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