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Debugger Limitations
MCU Applications Engineering
6.0 System Operation & Limitations
The kit provides sophisticated debugging features at a low cost but it does have some limitations
when used with KD30 Debugger and ICD. Section 6.1 introduces the ROM monitor program and
how it is used. The limitations when this ROM monitor is running with the user program are listed
in table 6-1.
Table 6-1 Systems Limitations During Debug (when used with ICD + KD30)
Item Please Refer To
6.2 Pin Usage Limitations
6.3 Memory Map
User Limitations 6.4 Status After Reset
6.5 Register Operation Limitations
6.6 Limitations on Interrupts
6.7 Stop or Wait Mode Limitations
6.8 User Program’s Real-time Capability
6.1 Kernel (ROM Monitor) Introduction
During debug (used with the KD30 debugger), a small program, called a kernel, is downloaded to
the R8C/13. The kernel communicates with the KD30 Debugger through the ICD about MCU
status during user code debugging operations.
There are no special steps required in the user program to make use of the ICD. The operation of
the kernel is transparent to the user but there are some limitations and these are discussed from
section 6.2.
After starting KD30, the ICD downloads the kernel to the R8C/13 if it does not exist (e.g. blank
device or programmed with FoUSB Programmer). After downloading the kernel, KD30 opens the
Program Window and the R8C/13 is ready for downloading code.
Connecting the ICD without starting KD30 will not affect the lines connected between the ICD and
the R8C/13 – the ICD keeps the lines in high-impedance state. The ICD only drives the pins after
KD30 or FoUSB Programmer is started.
After program debug and verification, you can then create and download a binary, Intel (.hex) or
Motorola (.mot), file to the R8C/13. This operation erases the kernel and only leaves the user
program.
6.2 Pin Usage Limitations
SIO/UART1 pins are used for communication between the Mini R8C board kernel and the host
computer through the ICD. Do not connect these pins to any other pins. UART1 cannot be used
in the user program. For details, please see ICD (RTA-FoUSB-MON) User Manual Section 5,
Target M16C ROM Monitor Resources.
6.3 Memory Map
Figure 6-2 shows the R5F21134FP memory map. The user memory area includes:
? RAM area – 1K Bytes
? Flash ROM area – 14 KB
SKP8CMINI-13 User’s Manual Rev. 1.0
11/22
October 2004
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