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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 the HEW 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 the ICD)
Item
User Limitations
Debugger Limitations
Please Refer To
6.2 Pin Usage Limitations
6.3 Memory Map
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, a small program, called a kernel, is downloaded to the R8C/17. The kernel
communicates with HEW 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 a HEW Debug Session, the ICD downloads the kernel to the R8C/17 if it does not
exist (e.g. blank device or programmed with FoUSB Programmer). After downloading the kernel,
the R8C/17 is ready for downloading code.
Connecting the ICD without starting HEW will not affect the lines connected between the ICD and
the R8C/17 – the ICD keeps the lines in high-impedance state. The ICD only drives the pins after
HEW or FoUSB Programmer attempts to connect..
After program debug and verification, you can then create and download a binary, Intel (.hex) or
Motorola (.mot), file to the R8C/17. This operation erases the kernel and only leaves the user
program.
6.2 Pin Usage Limitations
The Mode and Reset pins are used for communication between the Mini R8C board kernel and
the host computer through the ICD. 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 R5F21174FP memory map. The user memory area includes:
? RAM area – 1K Bytes
? Flash ROM area – 14 KB
SKP8CMINI-17 User’s Manual Rev. 1.1
11/22
March 2005
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相关PDF资料
SKP8CMINI DEV EVALUATION KIT R8C/11
SL03 10001 CURRENT LIMITER INRUSH 10 OHM 1A
SL03 22101 CURRNT LIMITER INRUSH 220 OHM 1A
SL05 30001 CURRENT LIMITER INRUSH 30 OHM 1A
SL05 4R003 CURRENT LIMITER INRUSH 4 OHM 3A
SL05 5R001 CURRENT LIMITER INRUSH 5 OHM 1A
SL08 10002 CURRENT LIMITER 10 OHM 2.5A
SL08 12101 CURRNT LIMITER INRUSH 120 OHM 1A
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