E2, IE850A
2. Connecting the Emulator and User System
R20UT4140EJ0300 Rev.3.00
Page 11 of 41
Oct.09.20
2.3.2
Example of recommended connections for only programming (2-wire UART)
Figure 2-4 Example of Connection
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Refer to section 2.3.4, Connecting the RESET pin, for more information on the reset circuit.
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For details on TVDD, refer to section 2.3.5, Connecting the TVDD pin.
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Make wiring runs between the 14-pin connector and target device as short as possible (within 50 mm is
recommended). Do not connect the signal lines between the connector and MCU to other signal lines.
•
Use GND to apply a guard ring for the wiring which runs between the 14-pin connector and target device.
Do not route high-speed signal lines parallel to each other or allow them to cross each other.
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Pin names may vary among target devices. Refer to the user’s manual for the target device you are using
for the actual pin names.
•
Proceed with appropriate processing for pins of target devices which do not require connection to the
emulator in accord with the descriptions in “Handling of Unused Pins” in the user’s manual for the target
device.
•
During programming (when the RFP is in use), the emulator outputs the high level on FPMD0 and the low
level on FPMD1 to cause the device to enter serial programming mode. Connect MD1 and FPMD1 as
required.
