Renesas SH7781 Technical Information PDF herunterladen (Seite 14)

Section 1 Connecting the Emulator with the User System

Rev. 2.00 Jan. 28, 2008 Page 6 of 32

REJ10J1422-0200

1.5 Recommended Circuit between the H-UDI Port Connector and the

MPU

1.5.1 Recommended Circuit (38-Pin Type)

Figure 1.2 shows a recommended circuit for connection between the H-UDI port connector (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 1.2 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 regardless of whether the H-UDI is used or not.

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 any other components on the board.

6. Since the H-UDI and AUD of the MPU operates with the VDDQ (3.3 V) voltage,

supply only the VDDQ (3.3 V) voltage to the UVCC pin.

7. The resistance value shown in figure 1.2 is 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.

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Renesas SH7781 Technical Information Seite 14