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MAXQ3120 Datasheet(PDF) 11 Page - Dallas Semiconductor |
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MAXQ3120 Datasheet(HTML) 11 Page - Dallas Semiconductor |
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11 / 33 page  High-Precision ADC Mixed-Signal Microcontroller ____________________________________________________________________ 11 Refer to the user’s guide supplement for this device for more details. In all cases, whichever memory segment is currently being executed from cannot be accessed in data space. To allow the use of lookup tables and similar constructs in the flash memory, the utility ROM contains a set of lookup and block copy routines (refer to the user’s guide supplement for this device for more details). The incorporation of flash memory allows the device to be reprogrammed, eliminating the expense of throwing away one-time programmable devices during develop- ment and field upgrades. Flash memory can be pass- word protected with a 16-word key, denying access to program memory by unauthorized individuals. Stack Memory A 16-bit-wide internal stack provides storage for pro- gram return addresses and general-purpose use. The stack is used automatically by the processor when the CALL, RET, and RETI instructions are executed and interrupts serviced. The stack can also be used explic- itly to store and retrieve data by using the PUSH, POP, and POPI instructions. On reset, the stack pointer, SP, initializes to the top of the stack (0Fh). The CALL, PUSH, and interrupt-vector- ing operations increment SP, then store a value at the stack location pointed to by SP. The RET, RETI, POP, and POPI operations retrieve the value at the stack location pointed to by SP, and then decrement SP. Utility ROM The utility ROM is a 2kWord block of internal ROM memory that defaults to a starting address of 8000h. The utility ROM consists of subroutines that can be called from application software. These include: • In-system programming (bootloader) over the JTAG interface • In-circuit debug routines • Test routines (internal memory tests, memory loader, etc.) • User-callable routines for in-application flash pro- gramming and code space table lookup Figure 1. Memory Map DATA SPACE (WORD MODE) 87FFh 8000h 00FFh 0000h A0FFh A000h DATA SPACE (BYTE MODE) 8FFFh 8000h 01FFh 0000h 87FFh 3FFFh 8000h 0000h SYSTEM REGISTERS PROGRAM SPACE 256 x 16 DATA SRAM 2k x 16 UTILITY ROM 4k x 8 UTILITY ROM 512 x 8 DATA SRAM 256 x 16 DATA SRAM 2k x 16 UTILITY ROM 16 x 16 STACK M0 x0h x1Fh M1 M2 M3 0xh 1xh 2xh 3xh AP x0h xFh A PFX IP 8xh 9xh Bxh SP DPC DP Dxh Exh Fxh Cxh PERIPHERAL REGISTERS 16k x 16 PROGRAM FLASH OR MASKED ROM |
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