Renesas SH7050 Series Informations techniques télécharger pdf (Page 19)

Section 2 User System Interface

All user system interface signals are directly connected to the MCU in the E6000 with no buffering

except for those listed below which are connected to the MCU through control circuits:

• NMI

• RES

•

MD3, MD2, MD1, MD0

•

EXTAL

•

HSTBY

• WDTOVF

2.1 Signal Protection

All user system interface signals are protected from over- or under-voltage by use of diode arrays

except for the AVcc.

Pull-up resistors are connected to the port signals except for the analog port signals.

The Vcc pins (except for the AVcc pin) at the head of the user system interface cable are

connected together. The E6000 monitors this and determines whether the user system is

connected.

2.2 User System Interface Circuits

The interface circuit between the MCU in the E6000 and the user system has a signal delay of

about 8 ns due to the user system interface cable and it includes pull-up resistors. Therefore, high-

impedance signals will be pulled up to the high level. When connecting the E6000 to a user

system, adjust the user system hardware to compensate for propagation delays.

The following diagrams show the interface signal circuits.

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Renesas SH7050 Series Informations techniques Page 19