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6.6. Global Variable RAM Usage
You may create as many global variables for your user program as RAM space is available (896 bytes). A
virtual RAM section at the start of the debugger’s RAM has been created to warn you if you try to allocate
too much global RAM. Below is an example of the linker warning you will receive if you exceed the
available RAM space:
Phase M16C Linker starting
C:\WorkSpace\test\test\sect30_zdk28.inc(186) : Warning (ln30):
C:\WorkSpace\test\test\Coord_Router\_ncrt0_zdk28.r30 :
'DATA' section 'debugger_NE' is overlapped on the 'bss_NE' from 2380H to
2380H
6.7. MAC Address Area
Every 802.15.4 radio needs a globally unique 64-bit MAC address. Therefore, your ZDK boards have
been pre-programmed with such an address. Please do not erase the Flash block that contains this
address. If you accidentally do erase the MAC address, you can find .mot files with replacement
addresses in the C:\Renesas\RZB_ZMD16C_ZDK\Demos\Replacement MAC Addresses directory.
Program one of those addresses into your board using the FoUSB programming software. Please make
sure that the address you pick is unique and different from any address used by your other ZDK boards.
6.8. ZbROM Flash Size
The ZbROM area contains the ZigBee protocol stack and the RTOS used by the stack. The ZbROM
image occupies the two lower 32kBytes MCU Flash memory blocks for a total of 64kBytes. This allocation
was done to prevent the code from being erased by the debugger when downloading your user code. The
actual Flash memory size used by the ZigBee stack and RTOS will be less depending on ZigBee stack
configuration settings when using the full development environment.
6.9. ZbROM RAM Size
The RAM allocated for use by the ZigBee stack and RTOS is the maximum amount that would be used if
the device were to function as a ZigBee coordinator. The actual RAM size used by the ZigBee stack and
RTOS will be less for other ZigBee stack configurations when using the full development environment.
6.10. ZigBee Stack Table Sizes
Table 6-4: ZigBee Stack Table Sizes
ZigBee Coordinator & Router
Number of Entries
ZigBee End Device
Number of Entries
Neighbor Table 15 4
Router Table 15 0
Router Discovery Table 15 0
Broadcast Transmission Table 20 20
RZB-ZMD16C-ZDK User’s Manual Rev 1.2 15/ 33 August 2006