NEC uPD780328 Subseries - Manual (Page 28)

CHAPTER 3 INSTALLATION
User’s Manual U16214EJ1V0UM
28
3.2.3 Subsystem clock settings
Table 3-2. Subsystem Clock Settings
IE-780338-NS-EM1 IE-78K0-NS or IE-78K0-NS-A Frequency of Subsystem Clock to Be Used
X2 Socket JP8
When using clock (XT1)
that is already mounted
on emulation board
32.768 kHz 6 to 8 shorted
When using clock
mounted by user
Oscillator assembled by user
1 to 2 side shorted
When using external
clock
Other than
32.768 kHz
Not used 3 to 4 side shorted
Caution Jumper JP8, which is used to select the board’s clock or an external clock, should be set only
after turning off the power of the IE-78K0-NS or IE-78K0-NS-A.
Remark When the IE-780338-NS-EM1 is shipped, the settings for “when using clock that is already mounted on
emulation board” are preset.
(1) When using clock that is already mounted on emulation board
When the IE-780338-NS-EM1 is shipped, a 32.768 kHz crystal resonator (XT1) and the parts board (X2) on
which pins 6 and 8 are shorted are already mounted on the IE-780338-NS-EM1. Short the 1 to 2 side on the
jumper (JP8) of the IE-78K0-NS or IE-78K0-NS-A. There is no need to make any other settings via the
integrated debugger (ID78K0-NS).
(2) When using the clock mounted by user
Execute the settings described under either (a) or (b), depending on the type of clock to be used. Short the 1 to
2 side on the jumper (JP8) of the IE-78K0-NS or IE-78K0-NS-A.
For the jumper position, refer to the IE-78K0-NS User’s Manual (U13731E) when using the IE-78K0-NS, and
refer to the IE-78K0-NS-A User’s Manual (U14889E) when using the IE-78K0-NS-A.
There is no need to make any other settings via the integrated debugger (ID78K0-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
<1> Prepare the IE-780338-NS-EM1.
<2> Solder the ceramic resonator or crystal resonator, resistor Rx, capacitor CA, and capacitor CB (all with
suitable oscillation frequency) onto the parts board (X2) (as shown below).