NEC V850/SF1 4.2 NMI Signal, 4.3 VPP Signal, 4.4 NMI Signal Mask Function

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CHAPTER 4 CAUTIONS

User’s Manual U15447EJ1V0UM 25

4.2 NMI Signal

The input signal (NMI signal) from the target system is delayed (tpD = 0.25 ns (TYP.)) because it passes through

QS3125 (Q switch), and I/O signals (ports 4, 5, 6, 9, 11) pass through QS3384 (Q switch) before it is input to the

emulator chip.

In addition, the DC characteristics change. The input voltage becomes VIH = 2.0 V (MIN.), VIL = 0.8 V (MAX.), and

the input current becomes IIN = ±0.5

A (MAX.).

Figure 4-2. NMI Signal Flow Path

4.3 VPP Signal

The VPP signal from the target system is left open in the emulator.

4.4 NMI Signal Mask Function

When using the P00/NMI pin in the port mode, do not mask the NMI signal.

NMI pin QS3125

IE-703079-MC-EM1

Port pin QS3125

Target

system Emulator chip

NMI signal

Port signal

Contents

Main Users Manual IE-703079-MC-EM1 Page Page Regional Information NEC Electronics Hong Kong Ltd. components, host computers, power plugs, AC supply voltages, and so forth) NEC Electronics Inc. (U.S.) NEC Electronics (UK) Ltd. INTRODUCTION Page Page Page Page CHAPTER 1 OVERVIEW 1.1 Hardware Configuration 1.2 Features (When Connected to IE-703002-MC) 1.3 Function Specifications (When Connected to IE-703002-MC) 1.4 System Configuration 1.5 Contents in Carton Page 1.6 Connection Between IE-703002-MC and IE-703079-MC-EM1 Page Page CHAPTER 2 NAMES AND FUNCTIONS OF COMPONENTS Page Page Page 2.3 Illegal Access Detection ROM Setting 2.4 CPU Operation Voltage Range Switching Setting Page CHAPTER 4 CAUTIONS 4.1 VDD0 and PORTVDD of Target System 4.2 NMI Signal 4.3 VPP Signal 4.4 NMI Signal Mask Function 4.5 Bus Interface Pin Page CHAPTER 5 DIFFERENCES BETWEEN TARGET DEVICE AND TARGET INTERFACE CIRCUIT Figure 5-1. Equivalent Circuit of Emulation Circuit (1/5) Figure 5-1. Equivalent Circuit of Emulation Circuit (2/5) Figure 5-1. Equivalent Circuit of Emulation Circuit (3/5) Figure 5-1. Equivalent Circuit of Emulation Circuit (4/5) Probe side IE system side Socket 1-2 shorted Internal circuit Figure 5-1. Equivalent Circuit of Emulation Circuit (5/5) Users Manual U15447EJ1V0UM APPENDIX PACKAGE DRAWINGS IE-703002-MC + IE-703079-MC-EM1 (Unit: mm) Facsimile Message Thank you for your kind support. From: