HD64F2134ATF20 Datasheet, PDF (24/39 Pages) Renesas Technology Corp – E6000 Emulator HS2148EPI61H Supplementary Information

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
· MD1, MD0
· XTAL
· EXTAL
· WAIT
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 and Vref.
Pull-up resistors are connected to the port signals except for the analog port signals.
The Vcc signals (except for AVcc signals) at the head of the user system interface cable are
connected together, which is monitored by the E6000 to detect whether the user system hardware
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 equivalent circuit examples of the interface signals.
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