Renesas SuperH SH7710 E10A Technické informace stáhnout pdf (Strana 17)

1.5.2 Recommended Circuit (14-Pin Type)

Figure 1.5 shows a recommended circuit for connection between the H-UDI and AUD port

connectors (14 pins) and the MPU when the emulator is in use. Figure 1.6 shows a circuit for

connection when UVCC is not connected.

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

The /ASEMD0 pin must be 0 when the emulator is connected and 1 when the

emulator is not connected, respectively.

(1) When the emulator is used: /ASEMD0 = 0 (ASE mode)

(2) When the emulator is not used: /ASEMD0 = 1 (normal mode)

Figures 1.5 and 1.6 show examples of circuits that allow the /ASEMD0 pin to be

GND (0) whenever the emulator is connected by using the user system interface cable.

When the /ASEMD0 pin is changed by switches, etc., ground pin 9. Do not connect

this pin to the /ASEMD0 pin.

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

TCK from other resistances.

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.

When the power supply of the user system is turned off, supplying VccQ of the user

system to the UVCC pin reduces the leakage current from the emulator to the user

system. A level shifter that is activated by the internal power supply or user power

supply (changed by the switch) is installed in the interface circuit of the emulator. If

the user power is supplied to the UVCC pin, the level shifter is not activated as long as

no user power is supplied. When the power supply of the user system is turned off, no

current flows from the user interface. The I/O voltage level of the user system

interface can be the same as that of the VccQ. To operate the emulator with low

voltage (lower than 3.3 V), the VccQ must be supplied to the UVCC pin. Make the

emulator’s switch settings so that the VccQ will be supplied (SW2 = 1 and SW3 = 1)

(as shown in figure 1.5).

The resistance values shown in the figures are recommended.

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

manual of the related MPU.

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Renesas SuperH SH7710 E10A Technické informace Strana 17