Campbell Scientific CR23X Micrologger User Manual
Page 41
SECTION 1. FUNCTIONAL MODES
1-7
Operating System
(128 Kbytes)
Active Program
(32 Kbytes Code)
Stored Programs
(32 Kbytes Code)
(32 Kbytes Labels)
Temporary Copy of
Current Program
Saved during
download if download
is aborted
(64 Kbytes)
Alphanumeric Labels
(32 Kbytes)
Unassigned
(192 Kbytes)
SRAM/FLASH
Total 1152 Kbytes
Flash Memory
(EEPROM)
Total 512 Kbytes
How it works:
The Operating System is loaded into
Flash Memory at the factory. System
Memory is used while the CR23X is
running for calculations, buffering data
and general operating tasks.
Any time a user loads a program into
the CR23X, the program is compiled in
SRAM and stored in the Active
Program areas. If the CR23X is
powered off and then on, the Active
Program is loaded from Flash and run.
The Active Program is run in SRAM to
maximize speed. The program
accesses Input Storage and
Intermediate Storage and stores data
into Final Storage for later retrieval by
the user.
The Active Program can be copied into
the Stored Programs area. While 98
program "names" are available, the
number of programs stored is limited
by the available memory. Stored
programs can be retrieved to become
the active program. While programs
are stored one at a time, all stored
programs are erased simultaneously.
That is because the flash memory can
only be written to once before it must
be erased and can only be erased in 16
Kbytes blocks.
(Memory Areas separated by dashed
lines:
can be re-sized by the user.)
1 byte per character stored. 9 bytes
per input location label. All final
storage label characters plus 2 bytes
per table name (array ID name) and
field name.
Memory available only to
system
Memory shared between
Program, Input Storage,
and Intermediate Storage
Memory allocable to Final
Storage 1 and 2 only
Memory available only to
Final Storage area 1
32K SRAM
System Memory
4096 Bytes
Active Program
Default
2048 Bytes
Input Storage
Default
112 Bytes
28 Locations
Intermediate Storage
Default
256 Bytes
64 Locations
96K SRAM
Final Storage 1 and 2
98,304 Bytes
49,154 Locations
1M FLASH
Final Storage 1 and 2
917,504 Bytes
458,752 Locations
or
4M FLASH
Final Storage 1 and 2
4,292,610 Bytes
2,146,305 Locations
Final Storage 1 Only
131,072 Bytes
65,536 Locations
FIGURE 1.5-1. CR23X Memory