Chapter 4 Differences Between Target Devices And Target Interface Circuits - NEC uPD780318 Subseries User Manual

CHAPTER 4 DIFFERENCES BETWEEN TARGET DEVICES AND TARGET INTERFACE CIRCUITS

This 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 of
emulation 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 to
operate 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 ( µ PD780009A)
(2) Signals input or output from the emulation CPU ( µ PD78F0338)
(3) Other signals
The 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 ( µ µ µ µ PD780009A)
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 ( µ µ µ µ PD78F0338)
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, AV
REF1
• S23 to S0
• COM3 to COM0
(3) Other signals
See Figure 4-3 Equivalent Circuit of Emulation Circuit.
• V
, V
DD1 DD0
• V
, V
SS1 SS0
• X2, XT2
• V
PP
• CAPL, CAPH, V
LCDC
• RESET
• X1
• XT1
Caution The same applies to the connection of alternate-function pins as no circuits exist in the IE
system.
, AV , AV
REF0 SS0
, V , V , V
LC2 LC1 LC0
User's Manual U16214EJ1V0UM
37