NEC IE-784225-NS-EM1 User Manual page 39

CHAPTER 4 DIFFERENCES BETWEEN TARGET DEVICES AND TARGET INTERFACE CIRCUITS
Probe side
XT1
22 pF
XT2
TEST/V
PP
The internal IE system voltage is selected for the TEST/V
the target is selected after reset is released.
(3) Other signals
• V
pin
DD
When the emulation CPU is operating at 5 V, its power is supplied from the internal IE system, but when
operating at low voltage, its power is supplied from the low-voltage pin (TP1). The V
is only used to control the LED (USERV
supply.
• V
pin
SS
The V pin is connected to GND inside the IE system.
SS
Figure 4-4. Equivalent Circuit 4 of Emulation Circuit
10 MΩ
HCU04 HCU04
470 kΩ
32.768 kHz
22 pF
(Open)
1 MΩ
) in the IE system that monitors the input of the target system's power
DD
User's Manual U13742EJ2V0UM
V
CC
4.7 kΩ
V
CC
4.7 kΩ
6 8
IC socket
JP1
HC4053
input to the IE system during reset. The voltage from
PP
IE-78K4-NS side
1
VHC244
2
XT1
3
TEST/V
PP
pin of the target system
DD
39