Renesas SH7641 Información técnica descargar pdf (Pagina 12)

4.2 Recommended Circuit (14-Pin Type)

Figure 4.2 shows a recommended circuit between the H-UDI port connector and the MCU.

Notes: 1. Do not connect anything to the N.C. pin of the H-UDI port connector.

2. The processing of the /ASEMD0 pin differs depending on whether the emulator is

used or not. As the emulator does not control this pin, it must be controlled by a

switch on the board.

(1) When the emulator is used: /ASEMD0 = low (ASE mode)

(2) When the emulator is not used: /ASEMD0 = high (normal mode)

3. The reset signal in the user system is input to the /RESETP pin of the MCU. Connect

this signal to the H-UDI port connector as the output from the user system.

4. When a joined resistance is used for pull-up, it may be affected by a noise. Separate

TCK from other resistances.

5. 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.

6. The resistance values shown in figure 4.2 are recommended.

7. For the pin processing in cases where the emulator is not used, refer to the hardware

manual of the related device.

TCK

TMS

N.C.

TDO

TDI

GND

H-UDI port connector

(14-pin type)

MCU

Reset signal

3.3 V

4.7 kΩ

RESET

1 kΩ

3.3 V

4.7 kΩ

ASEBRKAK

TRST

TCK

RESETP

TMS

TDO

TDI

TRST

ASEBRKAK

ASEMD0

Figure 4.2 Recommended Circuit for Connection between the H-UDI Port Connector and

MCU (14-Pin Type)

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Renesas SH7641 Información técnica Pagina 12

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