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MAXQ3212-EJX Datasheet(PDF) 8 Page - Maxim Integrated Products

Part # MAXQ3212-EJX
Description  Microcontroller with Analog Comparator and LED Driver
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAXQ3212-EJX Datasheet(HTML) 8 Page - Maxim Integrated Products

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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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