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E30A Emulator User's Manual
3.2.3 Emulator Tab
This tab permits you to specify the clock supplied to the target MCU and data acquisition interval of the RAM monitor.
(1) Clock
Specify the X
clock and the frequency that supplied to the target MCU.
IN
- Xin: Enter the frequency of the X
board).
- PLL: Enter the frequency of the MCU's internal PLL, which should be the same as the value to be set in the user
program.
- CCR: Enter the value for the MCU's internal clock control register, which should be the same as the value to be set in
the user program.
Notes on Clock Setting:
The emulator sets the PLL-related settings before starting up in order to secure a communication path.
In a user program, be sure to set the same value of the PLL-related settings specified by the emulator
debugger. Otherwise, the emulator will be out of control. The divide ratios of the CPU clock and
peripheral clock can be changed in the user program.
The X
clock is used to enter the debug mode and to stop the user program forcibly. Therefore, do not
IN
stop the X
clock in the user program.
IN
The PLL clock divided by the base clock divider is used for communication between the emulator and
the MCU. Therefore, do not change the PLL frequency and the divide ratio of the base clock in the user
program.
When the emulator is connected, the PLL clock stop bits are ignored. Therefore, the PLL keeps
oscillating even when the WAIT or STOP instruction is executed. This means that BCLK is also
oscillating, so that control returns from WAIT or STOP by an INT8, 7 or 6 or other interrupt request.
The clock can be switched to a low speed clock (f256, fC, fOCO4). However, as the CPU operation
clock becomes slower, the response speed of the emulator debugger becomes also slower.
Furthermore, the internal flash ROM cannot be rewritten during a low speed clock operation. Therefore,
do not use software breaks.
R20UT0422EJ0501 Rev.5.01
Mar 15, 2016
clock, and select Generated (Internal generator circuit) or Internal (Oscillator circuit
IN
3. Starting Up the Emulator Debugger
Page 35 of 65
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