Technical information

Section 2 Connecting the Emulator to the User System
Rev. 5.00 Aug. 18, 2009 Page 23 of 78
REJ10J1237-0500
2.5 Recommended Circuit between the H-UDI Port Connector and the
MCU
2.5.1 Recommended Circuit (36-Pin Type)
Figure 2.11 shows a recommended circuit for connection between the H-UDI and AUD port
connectors (36 pins) and the MCU when the emulator is in use.
Notes: 1. Do not connect anything to the N.C. pins of the H-UDI port connector.
2. The _ASEMD pin must be 0 when the emulator is connected and 1 when the emulator
is not connected, respectively.
(1) When the emulator is used: _ASEMD = 0 (ASE mode)
(2) When the emulator is not used: _ASEMD = 1 (normal mode)
Figure 2.11 shows an example of circuits that allow the _ASEMD pin to be GND (0)
whenever the emulator is connected by using the user system interface cable.
3. When a network resistance is used for pull-up, it may be affected by a noise. Separate
TCK from other resistances.
4. The pattern between the H-UDI port connector and the MCU must be as short as
possible. Do not connect the signal lines to other components on the board.
5. The AUD signals (AUDCK, AUDATA3 to AUDATA0, and _AUDSYNC) operate in
high speed. Isometric connection is needed if possible. Do not separate connection nor
connect other signal lines adjacently.
6. Supply the operating voltages of the H-UDI and AUD of the MCU to the UVCC pin.
7. The resistance values shown in figure 2.11 are for reference.
8. For the pin processing in cases where the emulator is not used, refer to the hardware
manual of the related MCU.
9. For the AUDCK pin, guard the pattern between the H-UDI port connector and the
MCU at GND level.
10. When the MCU does not support the AUD function or the AUD function is not used,
do not connect anything to the AUD pins (AUDCK, AUDATA3 to AUDATA0, and
_AUDSYNC) of the H-UDI port connector.