Renesas SuperH SH7200 Series Manual de usuario descargar pdf (Pagina 18)

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 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

(2) When the emulator is not used: _ASEMD = 1

Figure 1.7 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.

When the _ASEMD pin is changed by switches, etc., ground pin 3. Do not connect

this pin to the _ASEMD 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 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. Since the H-UDI and the AUD of the MCU operate with the PVcc, supply only the

PVcc 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 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

MCU at GND level.

9. 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.

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 MCU.

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Renesas SuperH SH7200 Series Manual de usuario Pagina 18