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QB-78K0FX2L In-Circuit Emulator
4.1 Cautions Regarding Differences Between Target Device and Emulator
When debugging is performed by connecting the QB-78K0FX2L to the target system, the QB-78K0FX2L emulates the
target device as if it operates in the target system.
differently in the following ways. Consequently, the target device should be used for final evaluation before launching
mass production, and the customer is to be responsible for judging the appropriateness of applying the QB-78K0FX2L.
- On-chip debug function
The on-chip debug function cannot be emulated.
- Oscillator
The QB-78K0FX2L does not support clock input by an oscillator in the target system. Consequently, the
operation clock frequency when the target device is mounted in the target system may differ from the operation
clock frequency when the QB-78K0FX2L is connected.
- Pin characteristics
The pin characteristics of the QB-78K0FX2L slightly differ when the target device is mounted to the target system,
because a connector, adapter, emulation probe, and circuit board exist between the QB-78K0FX2L and the target
system. In particular, note that the A/D converter conversion results are commonly-affected.
- Target system voltage during a break
Do not decrease the voltage of the target system during a break.
A reset that is generated by the low-voltage detector (LVI) or by power-on-clear (POC) during a break may cause
an incorrect operation of the debugger or communication errors.
- The response time of the comparator
The response time of the comparator differs from that of the device.
R20UT2057EJ0100 Rev.1.00
2012.05.18
CHAPTER 4
However, the target device and the QB-78K0FX2L operate
Table 4-1. The response time of the comparator
Item
Target device
70ns (2.7 to 5.5V)
IECUBE
140ns (5.5V)
120ns (3.3V)
CAUTIONS
response time
CHAPTER 4 CAUTIONS
Page 32 of 37
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