Renesas User System Interface Cable HS2655ECH61H Technické informace stáhnout pdf (Strana 20)

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

· RESET

· MD2, MD1, MD0

· XTAL

· EXTAL

· WAIT

l l

l P

tec

ecec

ect

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

except for the AVcc and Vref.

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 the voltage level of the Vcc pins and displays the

power-supply status in the Status Window.

ser

er er

er S

m m

m I

ter

erer

erf

ace

ce ce

ce C

irc

rcrc

rcu

The interface circuit between the MCU in the E6000 emulator 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

emulator 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 User System Interface Cable HS2655ECH61H Technické informace Strana 20