Renesas RZB-ZMD16C-ZDK user manual Global Variable RAM Usage, MAC Address Area, ZbROM Flash Size

Applications Engineering

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	ZigBee End Device
	Number of Entries	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