UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 188

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

5.4 System Clock Oscillator
5.4.1 X1 oscillator
pins.
5.4.2 XT1 oscillator
186
The X1 oscillator oscillates with a crystal resonator or ceramic resonator (4 to 20 MHz) connected to the X1 and X2
An external clock can also be input. In this case, input the clock signal to the EXCLK pin.
Figure 5-9 shows an example of the external circuit of the X1 oscillator.
Cautions are listed on the next page.
The XT1 oscillator oscillates with a crystal resonator (standard: 32.768 kHz) connected to the XT1 and XT2 pins.
An external clock can also be input. In this case, input the clock signal to the EXCLKS pin.
Figure 5-10 shows an example of the external circuit of the XT1 oscillator.
Cautions are listed on the next page.
(a) Crystal or ceramic oscillation
Crystal resonator
or
ceramic resonator
(a) Crystal oscillation
Figure 5-10. Example of External Circuit of XT1 Oscillator
Figure 5-9. Example of External Circuit of X1 Oscillator
32.768
kHz
V
X1
X2
SS
V
XT1
XT2
SS
Preliminary User’s Manual U19748EJ1V0UD
CHAPTER 5 CLOCK GENERATOR
External clock
External clock
(b) External clock
(b) External clock
EXCLK
EXCLKS