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Applications Engineering
6.5 Limitations on Interrupts - Vectors that Reside in the Hardware Vector Table
Table 6-4 lists the limitations on hardware interrupt (i.e. fixed) vector addresses.
Table 6-4. Interrupt Vector Addresses
Interrupt Cause M16C/26A Vector
Address
Undefined FFFDCH ~ FFFDFH
Overflow FFFE0H ~ FFFE3H
BRK Instruction FFFE4H ~ FFFE7H
Address Match FFFE8H ~ FFFEBH
Single-step FFFECH ~ FFFEFH
Watchdog Timer FFFF0H ~ FFFF3H
DBC FFFF4H ~ FFFF7H
NMI FFFF8H ~ FFFFBH
RESET FFFFCH ~ FFFFFH
Kit Specification
User available
User available
User inhibited
User inhibited
User inhibited
User available (Note 1)
User inhibited
User available
Reset vector (Note 2)
NOTES:
(1) The Watchdog Timer vector is shared with the oscillation stop and voltage detection
interrupt. The vector is available for oscillation stop and voltage detection interrupts, but
avoid using the vector for watchdog timer interrupts.
(2) The kernel transparently relocates the Reset vector to FFFD8H.
6.6 Stop or Wait Mode Limitations
The kernel cannot be run in STOP or WAIT modes. Do not use these modes when debugging
your program.
6.7 User Program’s Real-Time Capability
Please be aware that while the kernel is in a “STOP” state, the hardware peripherals will continue
to run. Therefore, interrupts may not be serviced properly. Also, the watchdog timer will not be
serviced and will likely time out if active.
While the kernel is in a “RUN” state, there is no overhead on the application code, UNLESS a
RAM monitor window is open in KD30. This window requires periodic communication with the
MCU. This communication suspends normal application operation while servicing the request
(approximately 2000 BCLK cycles for each 16 bytes of data displayed in the window are used per
window update). The user must determine whether or not this behavior is acceptable.
6.8 Performing Debug Using Symbols
Normally when a new project is created using HEW, debugging symbols are enabled. If you are
unable to debug your program using symbols in KD30, add the debug option [ -g ] in HEW before
compiling the programs. To enable the [ -g ] option, perform the following:
?
?
?
?
?
?
Open the workspace and project in HEW.
Select [Renesas M16C Standard Toolchain] from Options pull-down menu.
Click on Link tab.
Select [Output] under the [Category] list box.
Click on checkbox for [ -g ] ‘Outputs source debug information….’
Click on [OK] button
For more information, see the HEW user’s manual.
SKP16C26A User’s Manual Rev. 1.0
12 / 21
June 2004
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