Limitations Of The Zigbee Evaluation System; Timers; System Clock; Interrupts - Renesas ZigBee Demo RZB-CC16C-ZDK User Manual

5.2. Limitations of the ZigBee Evaluation System

The following is a list of limitations for the ZigBee Evaluation System (ZEK) platform. Due to the nature of
this evaluation system, the MCU resources that you can use for your own application development are
restricted. In addition, many of the configurations and customizations offered by the ZigBee protocol stack
are unavailable to you with the ZEK.
Please do not modify or disrupt any of the MCU resources used by the ZigBee stack:

5.2.1. Timers

Table 5-1: MCU Timer Usage
TA0 available
TA1 Used by ZigBee stack
TA2 Used by ZigBee stack
TA3 Used by ZigBee stack
TA4 Used by RTOS
TB0 Used by ZigBee stack
TB1 available
TB2 Used by ZigBee stack

5.2.2. 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.

5.2.3. 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 Timer A0
and UART 2 Receive. To implement your own sub-routines for those two interrupts, you need to re-direct
their respective interrupt vectors to the location of your interrupt service routines by calling the pre-defined
functions SetTimerA0Int() or SetUart2RxInt().

5.2.4. Flash and RAM Usage

The memory areas shaded in turquoise are available for your use.
Table 5-2: Flash Memory Usage
Flash Address Range
0xFF800-0xFFFFF
0xE8000-0xFF7FF
0xC0000-0xE7FFF
0x0F7FF-0x0FFFF
0x0F000-0x0F007
RZB-CC16C-ZDK User's Manual Rev 1.1
Usage
FoUSB Monitor Area (2KB)
User code/const space (30KB)
ZbROM Area (stack and RTOS) (64KB)
User Data Flash Area (2KB)
MAC Address (Don't Erase Block)
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Applications Engineering
December 2006