1.7 External Trigger Input Terminal Specifications
1.7External Trigger Input Terminal Specifications
The emulator has a TRIG terminal for input of external trigger signals.
■External trigger input terminal specifications
External trigger input is a function (external trigger break function) that is used to input a break signal from external test equipment, such as a logic analyzer connected to the emulator, to the evaluation MCU on the emulator.
Table
Table 1.7-1 External trigger input terminal specifications
Terminal name | Input or output | Description |
|
|
|
TRIG | Input | Used to input external trigger signals. |
|
| This terminal is used for break function control. |
|
| The active signal triggered by a transition from level L |
|
| to H or that by a transition from level H to L can be |
|
| selected. |
|
| A break occurs at detection of the selected active |
|
| signal that is input. |
|
|
|
Figure
74LVC244 (Vcc=3.3V)
To internal emulator circuit
TRIG terminal BNC connector
100 KΩ
GND GND GND
■Precautions on use
Before using the external trigger function, read the following explanation on break slip so that you understand its characteristics.
❍Break slip
A trigger signal input via the external trigger input terminal is encoded in the emulator internal circuit into the emulator interface command code. The signal is then transmitted to the evaluation MCU in the emulator system. The emulator interface has lower clock frequency than that the evaluation MCU (the ratio of these clock frequencies depends on the evaluation MCU used). Therefore, a relatively large break slip (in a range of dozens to hundreds of machine clock pulses) occurs between trigger signal input and the associated break operation of the evaluation MCU.
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