Section 8. Operation
316
Table 70. CR800 Memory Allocation
Memory
Sector
Comments
Internal battery-backed
SRAM
1
4 MB*
See table CR800 SRAM Memory
(p. 317) for detail.
Internal Flash
2
2 MB
Operating system
Internal Serial Flash
3
12 kB: Device Settings
500 kB: CPU: drive
Device Settings — A backup of settings such as PakBus address, station name, beacon
intervals, neighbor lists, etc. Rebuilt when a setting changes.
CPU: drive — Holds program files, field calibration files, and other files not frequently
overwritten. Slower than SRAM. When a program is compiled and run, it is copied here
automatically for loading on subsequent power-ups. Files accumulate until deleted with
File Control or the FilesManage() instruction. Use USR: drive to store other file types.
Available CPU: memory is reported in Status table field CPUDriveFree.
External Flash
(Optional)
2 GB: USB: drive
USB: drive — Holds program files. Holds a copy of requested final-storage table data
as files when TableFile() instruction is used. USB: data can be retrieved from the
storage device with Windows Explorer. USB: drive can facilitate the use of
Powerup.ini.
1
SRAM
·CR800 series changed from 2- to 4-MB SRAM in Sept 2007. SNs ≥ 3605 are 4 MB.
2Flash is rated for > 1 million overwrites.
3
Serial flash is rated for 100,000 overwrites (50,000 overwrites on 128-kB units). Care should be taken in programs that
overwrite memory to use the CRD: or USR: drives so as not to wear-out the CPU: drive.
·The CR800 series changed from 128- to 512-kB serial flash in May 2007. SNs ≥ 2787 are 512
kB.
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