CHAPTER 3 INSTALLATION
User’s Manual U16043EJ2V0UM
21
3.2
Clock Settings
3.2.1 Overview of clock settings
The system clock to be used during debugging can be selected from (1) to (3) below.
(1) Clock that is already mounted on emulation board
(2) Clock that is mounted by user
(3) External clock
If the target system includes an internal clock, select either
(1) Clock that is already mounted on emulation
board
or
(2) Clock that is mounted by user
. For an internal clock, the target device is connected to a resonator
and the target device’s internal oscillator is used. An example of the external circuit is shown in part (a) of Figure 3-2.
During emulation, the resonator that is mounted on the target system is not used. Instead, the clock that is mounted
on the emulation board which is connected to the IE-78K0-NS or IE-78K0-NS-A is used.
If the target system includes an external clock, select
(3) External clock
.
For an external clock, a clock signal is supplied from outside of the target device and the target device’s internal
oscillator is not used. An example of the external circuit is shown in part (b) of Figure 3-2.
Caution
The IE system will be hung-up if the system clock is not supplied normally. Moreover, be sure
to input a rectangular wave as the clock from the target. There is no need to supply a clock to
the X2 pin.
Figure 3-2. External Circuits Used as System Clock Oscillator
(a) Internal clock
(b) External clock
X2
X2
Target device
Target device
External
clock
X1
X1
