QB-78F1026
CHAPTER 4 CAUTIONS
R20UT0290JJ0100 Rev. 1.00
Page 27 of 29
Sep 30, 2010
CHAPTER 4 CAUTIONS
4.1 Cautions Regarding Differences Between Target Device and Emulator
When debugging is performed by connecting the QB-78F1026 to the target system, the QB-78F1026 emulates the
target device as if it operates in the target system. However, the target device and the QB-78F1026 operate 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-78F1026.
4.1.1
Operation after target system power application
After power application, a program will be executed for the target device mounted in the target system when reset is
released. However, with the QB-78F1026, the program does not start until an operation to start execution is performed
after the program is downloaded using the debugger.
4.1.2 Oscillator
The QB-78F1026 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-78F1026 is connected.
4.1.3 Pin
characteristics
The pin characteristics of the QB-78F1026 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-78F1026 and the target system.
4.1.4 On-chip
debug
function
The on-chip debug function cannot be emulated.
4.1.5 Current
consumption
The current consumption of the QB-78F1026 differs from that of the target device.
The current consumption may reach up to 198 mA. The same amount of current is consumed in standby mode.
4.1.6
TTL input buffer characteristics
If the port input mode register (PIM) is used to set the input of a pin that can be set for the TTL buffer to the TTL level,
the high-level input voltage characteristics differ between the target device and emulator. See Table 4-6 for details.
The following pins can be set for the TTL buffer.
Target pins: P03, P04, P10, P11, P142, P143
Table 4-1. High-Level Input Voltage Characteristics
Item Conditions
MIN
4.0 V
≤
V
DD
≤
5.5 V
2.2 V
2.7 V
≤
V
DD
< 4.0 V
2.0 V
Target device
1.8 V
≤
V
DD
< 2.7 V
1.6 V
IECUBE
Note
1.8
V
≤
V
DD
≤
5.5 V
2.0 V
Note
Use CMOS input if V
DD
is 2.0 V or less.
