Renesas Emulation Probe M306V8T-EPB - Manual (Page 79)

M306V8T-EPB User’s Manual 4. Hardware Specifications
REJ10J0777-0100 Rev.1.00 2005.08.01 Page 79 of 90
IMPORTANT
Note on Breaks:
The area displaying break points in the program window of the emulator debugger shows the following breaks.
(1) Address-match break
This is a debugging function which breaks a program, using the address-match interrupt function of the
MCU, immediately before the system executes an instruction at a specified address. The instruction at the
preset address will not be executed.
(2) Software break
This is a debugging function which generates a BRK interruption by changing an instruction at a specified
address to a BRK instruction (00h) to break a program immediately before the system executes an
instruction at a specified address. The instruction at the preset address will not be executed.
(3) Hardware break
This is a debugging function which breaks a program by setting the detection of an execution of an
instruction at a specified address as a break event. The program will break after the instruction at the
specified address is executed.
Notes on Software Breaks:
Software breaks change the instruction at a specified address to a BRK (00h). Therefore, take note that when
you reference the result of a trace in bus mode, "00h" is displayed.
The BRK instruction can be used for the emulator only. You cannot use it in a user program.
You can neither set nor cancel a software breakpoint in the internal ROM area of an MCU during user program
execution, while you can set or cancel it in the internal RAM area of an MCU or an area where chip select CS3*
to CS0* are set to INTERNAL (emulation memory).
Notes on Address-Match Breaks:
As the processing speed of setting and canceling address-match breaks is relatively fast, you can save the times
of writing into the internal flash ROM of an MCU. Therefore, address-match breaks precede the other breaks
when setting breakpoints in the internal flash ROM area of an MCU.
Address-match breaks can be set only in RAM and ROM areas of an MCU.
Address-match breaks can be set at up to eight points. The other breaks are set as software breaks.
Address-match breaks can be set or canceled even when the user program is being executed.
Notes on Power Supply to the User System:
Pins Vcc1 and Vcc2 are connected to the user system to observe the voltage. Therefore, the power is not
supplied to the user system from the emulator, design your system so that the user system is powered separately.
The voltage of the user system should be as follows.
3.15 V ≤ Vcc1 = Vcc2 = Vcc3 ≤ 3.45 V
Do not change the voltage of the user system after turning on the power.