CHAPTER 3 INSTALLATION
User’s Manual U13742EJ2V0UM
27
3.4.3 Subsystem clock settings
Table 3-2. Subsystem Clock Settings
IE-784225-NS-EM1
Frequency of Subsystem Clock
Parts Board (USCLK)
JP1
When using clock that is
already mounted on
emulation board
32.768 kHz
6 and 8 shorted
When using clock mounted
by user
Oscillator assembled by user
Short 1 and 2
When using external clock
Other than 32.768 kHz
Not used
Short 2 and 3
Caution
Jumper JP1, which is used to select the board’s clock or an external clock, should be set only after
turning off the IE-78K4-NS’s power.
Remark
The IE-784225-NS-EM1’s factory settings are those listed above under “when using clock that is already
mounted on emulation board”.
(1) When using clock that is already mounted on emulation board
When the IE-784225-NS-EM1 is shipped, a 32.768 kHz crystal resonator is already mounted on the IE-784225-
NS-EM1. Pins 6 and 8 on the parts board (USCLK) are shorted. Short pins 1 and 2 on the IE-784225-NS-EM1’s
jumper (JP1). There is no need to make any other settings via the integrated debugger (ID78K4-NS).
(2) When using clock mounted by user
The settings described under either (a) or (b) are required, depending on the type of clock to be used. Short pins
1 and 2 on the IE-784225-NS-EM1’s jumper (JP1).
There is no need to make any other settings via the integrated debugger (ID78K4-NS).
(a) When using a ceramic resonator or crystal resonator
•
Items to be prepared
•
Parts board
•
Capacitor CA
•
Ceramic resonator or crystal resonator
•
Capacitor CB
•
Resistor Rx
•
Solder kit
<Steps>
<1> Solder the target ceramic resonator or crystal resonator, resistor Rx, capacitor CA, and capacitor CB (all with
a suitable oscillation frequency) onto the supplied parts board (as shown below).
