Renesas MCU Board for PC4400 Emulator System M34282T5-OPT, User Manual

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5.4 System Clock
Depending on how the instruction clock is set, use the M34282T5-OPT in the range of frequencies
listed in table 5.2.
When the instruction clock is set to STCK = f(X
IN
) and the system clock frequency is over 500 kHz,
the emulator may not work properly.
Table 5.2 Operating frequencies of the M34282T5-OPT
* To change the system clock frequency, change the clock frequency of the oscillator circuit board
OSC-2. For details about the oscillation circuit constant, consult your oscillator manufacturer.
5.5 Real-time Capability of Timer
As the evaluation MCU is active even when program execution is stopped or when a command is
executed, its timer values are modified.
Examples: (1) When single-stepping instructions
(2) After program execution stopped
5.6 Power-down Mode
Although the M34282T5-OPT can execute a program using the POF instruction, there are precau-
tions and restrictions listed in Table 5.3.
Table 5.3 Precautions for power-down mode.
Voltage
3 V
Instruction clock
STCK = f(X
IN
)/8
STCK = f(X
IN
)
Frequency
4.0 MHz or less
500 kHz or less
Description
Although SAFE and ERROR LEDs of the PC4000E light up in the power-down mode, it is not
an error condition.
Do not use the POF instruction when single-stepping a program. The POF instruction can not
be executed correctly when stepped through.
No debug command of emulator debugger RTT72 can be executed. In the power-down mode,
execute the debug command after resuming by the key-on wakeup function.
The real-time trace result of the area including the POF instruction cannot be displayed
normally.
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