Fujitsu F2 MC-16L Operation Manual page 14

■ Clock supply
Clock is supplied to the evaluation MCU.
Figure 10 shows how to mount a crystal unit in an IC socket (SC2) on the adapter board. Figure 11
shows the clock peripheral circuit configuration. Figure 12 shows examples of subclock setting
jumper settings. Table 4 lists the settings of the main clock switch. Table 5 lists the settings of the
subclock switch.
Note : For a capacitor that is mounted with the oscillator, use a capacitor about 10pF smaller than the recom-
mended value of the oscillator.
When a capacitor of the recommended value of the oscillator is mounted, an oscillator stabilization time
becomes longer than the standard time due to the parasitic capacitance of a socket and the influence
of an interconnect load and that may cause a failure such as instability of clock switching operation etc.
PA1/X0A
PA2/X1A
10
Figure 10 Mounting a crystal oscillator unit
139
X0
195
X1
51
176
MAIN XTAL
1
Evaluation
2
MCU
3
4
GND
390 kΩ
33 pF/50 V
GND
Figure 11 Clock peripheral circuit configuration
SC2 MAIN XTAL
8
7
6
5
GND
32.768 kHz
10 pF/50 V
GND
FC SEL
1
X0
2
X1
3
PA1/X0A
4
PA2/X1A
5
6
7
8
SUB XTAL
X0A
X1A
C B A