CHAPTER 2 NAMES AND FUNCTIONS OF COMPONENTS
User’s Manual U14700EJ2V0UM
26
(4) Using the target system crystal oscillator as an external clock
<1> If a crystal/ceramic resonator is mounted in the CN2 socket, remove it.
<2> Set JP1 as shown in Table 2-5 (factory setting).
<3> Set the SW1 and CKSEL pins according to the clock mode to be used, as shown in Table 2-5.
<4> Select “External” in the clock source selection area in the configuration dialog box on the integrated
debugger (ID850).
Table 2-5. Settings When Using External Clock
Type of Clock Used
Clock Source
Selection
OSC1 Crystal
Oscillator
CN2 Crystal
Resonator
JP1
Setting
Clock
Mode
SW1
CKSEL
Pin
Note
PLL
Direct
PLL
Low-level
input
Use crystal oscillator
on target system as
external clock.
External
Crystal
oscillator can
be either
mounted or
not mounted
Mounting
prohibited
1
2
7
8
Direct
Direct
PLL
High-level
input
Note
The input setting to the CKSEL pin is made only when a target system is connected. Leave this pin open
when operating the emulator on a standalone basis.
Caution Be sure to input a clock generated by a crystal oscillator to the X1 pin.
When a clock generated by a crystal/ceramic resonator is used, the emulator does not operate
normally.
Figure 2-7. Outline When Using Crystal Oscillator on Target System as External Clock
IE-703116-MC-EM1
OSC1
IC20
“External”
CN2
JP1
IE-V850E-MC
V850E/IA1
I/O chip
CLKOUT
X1
CKSEL
EVA chip
Crystal/ceramic
resonator mounting
prohibited
SW1
PLL/Direct
mode
switching
Select
on ID850
1-2 shorted
3-4 shorted
5-6 open
7-8 open
Crystal
oscillator
Target system
Can be either
mounted or
not mounted
