CHAPTER 3 INSTALLATION
User’s Manual U16431EJ1V0UM
22
3.4
Clock Settings
3.4.1 Overview of clock settings
The main system clock and subsystem clock to be used during debugging can be selected from (1) and (1) and (2)
below, respectively.
(1) Clock that is already mounted on emulation board
(2) Clock that is mounted by user
If the target system includes a clock oscillator, select either
(1) Clock that is already mounted on emulation
board
or
(2) Clock that is mounted by user
. For the clock oscillator, a resonator is connected to the target device
and the target device’s internal oscillator is used. An example of the external circuit is shown in Figure 3-3. During
emulation, the oscillator that is mounted on the target system is not used. Instead, the clock that is mounted on the
emulation board installed in the IE-78K0S-NS or IE-78K0S-NS-A is used.
Caution
The IE system will be hung-up if the main system clock is not supplied normally. There is no
need to supply a clock to the X2 and XT2 pins. Also, even if a crystal resonator is connected
directly to X1 (for the main system clock) or XT1 (for the subsystem clock), the target device
will not operate.
Figure 3-3. External Circuits Used as System Clock Oscillator
Clock oscillator
X1 or XT1
Crystal or ceramic
resonator
V
SS
X2 or XT2
Target device
