System Clock Oscillator; X1 Oscillator; Xt1 Oscillator - NEC 78K0 Series User Manual

6.4 System Clock Oscillator

6.4.1 X1 oscillator

The X1 oscillator oscillates with a crystal resonator or ceramic resonator (1 to 20 MHz) connected to the X1 and X2
pins.
Figure 6-9 shows an example of the external circuit of the X1 oscillator.
Figure 6-9. Example of External Circuit of X1 Oscillator (Crystal or Ceramic Oscillation)
Cautions are listed on the next page.

6.4.2 XT1 oscillator

The XT1 oscillator oscillates with a crystal resonator (standard: 32.768 kHz) connected to the XT1 and XT2 pins.
Figure 6-10 shows an example of the external circuit of the XT1 oscillator.
Figure 6-10. Example of External Circuit of XT1 Oscillator (Crystal Oscillation)
Cautions are listed on the next page.
146
CHAPTER 6 CLOCK GENERATOR
V
SS
X1
X2
Crystal resonator
or
ceramic resonator
32.768
kHz
Preliminary User's Manual U17260EJ3V1UD
V
SS
XT1
XT2