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1.5 Recommended Circuit between the H-UDI Port Connector and the MPU 1.5.1 Recommended Circuit (36-Pin Type)
Figure 1.5 shows a recommended circuit for connection between the H-UDI and AUD port
connectors (36 pins) and the MPU 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 MPMD pin must be 0 when the emulator is connected and 1 when the emulator is
not connected, respectively.
(1) When the emulator is used: MPMD = 0
(2) When the emulator is not used: MPMD = 1
Figure 1.5 shows an example of circuits that allow the MPMD 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 /TRST pin must be at the low level for a certain period when the power is
supplied whether the H-UDI is used or not. Reduce the power supplied to the /TRST
pin by pulling the pin down by a resistance of 1 kilo-ohm and setting PUL15 = 0 in
the PULCR register after a reset.
5. The pattern between the H-UDI port connector and the MPU must be as short as
possible. Do not connect the signal lines to other components on the board.
6. Since the H-UDI and the AUD of the MPU operate with the VccQ, supply only the
VccQ to the UVCC pin. Make the emulator’s switch settings so that the user power
will be supplied (SW2 = 1 and SW3 = 1).
7. The resistance values shown in figure 1.5 are for reference.
8. For the pin processing in cases where the emulator is not used, refer to the hardware
manual of the related MPU.
9. For the AUDCK pin, guard the pattern between the H-UDI port connector and the
MPU at GND level.