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6.2. System Clock
After reset, the main system clock (denoted in the spec as f1) is set up to run at 20MHz. The ZigBee
stack assumes that the MCU is running at this operating frequency. Please do not make any changes to
the clock.
6.3. Interrupts
The interrupt vector table is located in the ZigBee stack and real-time operating system (RTOS) program
memory area (ZbROM). Therefore, you cannot implement any interrupt sub-routines other than the ones
listed below. To implement your own sub-routines for those interrupts, you need to re-direct their
respective interrupt vectors to the location of your interrupt service routines by calling the pre-defined
functions SetxxxInt().
Available User Interrupts Interrupt Routine Vector Set Function
Timer A0 void SetTimerA0Int(long funct_addr);
Timer B1 void SetTB1Int(long funct_addr);
UART 2 Rx void SetUart2RxInt(long funct_addr);
INT2 void SetInt2Int(long funct_addr);
INT3 void SetInt3Int(long funct_addr);
DMA 0 void SetDma0Int(long funct_addr);
DMA 1 void SetDma1Int(long funct_addr);
6.4. Flash and RAM Usage
The memory areas shaded in turquoise are available for your use.
Table 6-2: Flash Memory Usage
Flash Address Range Usage
0xFF800-0xFFFFF
FoUSB Monitor Area (2KB)
0xE8000-0xFF7FF
User code/const space (30KB)
0xC0000-0xE7FFF
ZbROM Area (stack and RTOS) (64KB)
0x0F7FF-0x0FFFF
User Data Flash Area (2KB)
0x0F000-0x0F007
MAC Address (Don’t Erase Block)
Table 6-3: RAM Memory Usage
RAM Address Range Usage
0x2380-0x23FF
FoUSB Monitor Area
0x2000-0x237F
User global variable space (896 bytes)
0x0400-0x1FFF
ZbROM area, user task stack <100 bytes
0x0000-0x03FF
MCU Register Area
6.5. Stack RAM Usage
Try to minimize the allocation of local variables that use stack space inside of functions. Remember that
your user application is running as a task in an RTOS with a limited amount of stack space allocated for it.
For this ZbRom system, that value is fixed and cannot be changed. You must limit the RAM space used
by your local variables and function calls to less than 100 bytes.
RZB-ZMD16C-ZDK User’s Manual Rev 1.2 14/ 33 August 2006