CHAPTER 4 DIFFERENCES BETWEEN TARGET DEVICES AND TARGET INTERFACE CIRCUITS
User’s Manual U16556EJ1V0UM
35
Figure 4-3. Equivalent Circuit 3 of Emulation Circuit
10 M
Ω
470 k
Ω
VHC244
XT1, XT2, IC/V
PP
Open
V
CC
4.7 k
Ω
IC socket
USCLK
HCU04
HCU04
6
8
22 pF
22 pF
32.768 kHz
IE system side
Probe side
(3) Other signals
•
V
DD
pin
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
DD
pin of the target system
is only used to control the LED (USERV
DD
) in the IE system that monitors the input of the target system’s power
supply.
•
V
SS
pin
The V
SS
pin is connected to GND inside the IE system.
