NEC uPD780318 Subseries User Manual

Contents

NEC uPD780318 Subseries User Manual Manual pdf 37 page image

User’s Manual U16214EJ1V0UM 37CHAPTER 4 DIFFERENCES BETWEEN TARGET DEVICES AND TARGET INTERFACE CIRCUITSThis chapter describes differences between the target device’s signal lines and the signal lines of the IE-780338-NS-EM1’s target interface circuit.Although the target device is a CMOS circuit, the IE-780338-NS-EM1’s target interface circuit consists ofemulation circuits such as an emulation CPU, TTL, and CMOS-IC.When the IE system is connected with the target system for debugging, the IE system performs emulation so as tooperate as the actual target device would operate in the target system.However, some minor differences exist since the operations are performed via the IE system’s emulation.(1) Signals input or output from the emulation CPU (μPD780009A)(2) Signals input or output from the emulation CPU (μPD78F0338)(3) Other signalsThe IE-780338-NS-EM1’s circuit is used as follows for signals listed in (1) to (3) above.(1) Signals input or output from the emulation CPU (μμμμPD780009A)See Figure 4-1 Equivalent Circuit of Emulation Circuit 1.• P47 to P40• P57 to P50• P67 to P60(2) Signals input or output from the emulation CPU (μμμμPD78F0338)See Figure 4-2 Equivalent Circuit of Emulation Circuit 2.• P05 to P00• P17 to P10• P25 to P20• P34 to P30• P73 to P70• P87 to P80• P97 to P90• P120• ANI8, ANI9, AVREF1 , AVREF0 , AVSS0• S23 to S0• COM3 to COM0(3) Other signalsSee Figure 4-3 Equivalent Circuit of Emulation Circuit.• VDD1 , VDD0• VSS1 , VSS0• X2, XT2• VPP• CAPL, CAPH, VLCDC, VLC2 , VLC1 , VLC0• RESET• X1• XT1Caution The same applies to the connection of alternate-function pins as no circuits exist in the IEsystem.