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MAXQ3212-EJX Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAXQ3212-EJX Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 25 page Microcontroller with Analog Comparator and LED Driver 8 _____________________________________________________________________ and the upper 3 bits containing the register subindex within that module. Any time that it is necessary to directly select one of the upper 24 index locations in a destination module, the prefix register PFX is needed to supply the extra destination bits. This prefix register write is inserted automatically by the assembler and requires only one additional execution cycle. Memory Organization The device incorporates several memory areas: • 2kWords of utility ROM • 1kWords of EEPROM for program storage • 128 bytes of EEPROM for data storage • 64 bytes of SRAM for storage of temporary variables • 4-level stack memory for storage of program return addresses and general-purpose use The memory is arranged by default in a Harvard archi- tecture, with separate address spaces for program and data memory. A special pseudo-Von Neumann memory mode allows data memory to be mapped into program space, permitting code execution from data memory. This places the utility ROM, code, and data memory into a single contiguous memory map. This is useful for applications that require dynamic program modification or unique memory configurations. In addition, another mode allows program memory to be mapped into data space, permitting code constants to be accessed as data memory. The incorporation of EEPROM for program storage allows the devices to be reprogrammed, eliminating the expense of throwing away one-time programmable devices during development and field upgrades. EEPROM can be pass- word protected with a 16-word key, denying access to program memory by unauthorized individuals. 1k x 16 PROGRAM MEMORY PROGRAM SPACE DATA SPACE (BYTE MODE) DATA SPACE (WORD MODE) 0000h 03FFh 2k x 16 UTILITY ROM 87FFh 64 x 16 EEPROM A020h 8000h A05Fh 4k x 8 UTILITY ROM 8FFFh 8000h 0040h 00BFh 2k x 16 UTILITY ROM 87FFh 8000h 32 x 16 SRAM A000h A01Fh 128 x 8 EEPROM 0000h 003Fh 64 x 8 SRAM 0020h 005Fh 64 x 16 EEPROM 0000h 001Fh 32 x 16 SRAM Figure 1. Memory Map |
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