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1.5.3
Recommended Circuit (38-Pin Type)
Figure 1.7 shows a recommended circuit for connection between the H-UDI and AUD port
connectors (38 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 1.7 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.
When the MPMD pin is changed by switches, etc., ground pin 3. Do not connect this
pin to the MPMD pin.
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 MPU 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 only the VCCQ voltage (I/O power supply) to the UVCC and UVCC_AUD
pins because the H-UDI and AUD of the MPU operate at the VCCQ voltage,
respectively. Make the emulator's switch settings so that the user power will be
supplied (SW2 = 1 and SW3 = 1).
7.
The resistance value shown in figure 1.7 is for reference.
8.
For the AUDCK pin, guard the pattern between the H-UDI port connector and the
MPU at GND level.
9.
When the power is supplied, the TRST# pin must be low during a specified period
regardless of whether or not the H-UDI is used.
10. The GND bus lead at the center of the H-UDI port connector must be grounded.
11. For the pin processing in cases where the emulator is not used, refer to the hardware
manual of the related MPU.
12
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