upd78f0148m1gka1-9eu Renesas Electronics Corporation., upd78f0148m1gka1-9eu Datasheet - Page 139

• Manufacturer Part Number: upd78f0148m1gka1-9eu
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

6.4
6.4.1
input the clock signal to the X1 pin and input the inverse signal to the X2 pin.
6.4.2
and XT2 pins.
this case, input the clock signal to the XT1 pin and the inverse signal to the XT2 pin.
The X1 oscillator oscillates with a crystal resonator or ceramic resonator connected to the X1 and X2 pins.
An external clock can be input to the X1 oscillator when the REGC pin is connected directly to V
Figure 6-8 shows examples of the external circuit of the X1 oscillator.
The subsystem clock oscillator oscillates with a crystal resonator (Standard: 32.768 kHz) connected to the XT1
External clocks can be input to the subsystem clock oscillator when the REGC pin is connected directly to V
Figure 6-9 shows examples of external circuit of the subsystem clock oscillator.
Cautions are listed on the next page.
System Clock Oscillator
X1 oscillator
Subsystem clock oscillator
(a) Crystal, ceramic oscillation
Crystal resonator or
ceramic resonator
Figure 6-9. Examples of External Circuit of Subsystem Clock Oscillator
(a) Crystal oscillation
Figure 6-8. Examples of External Circuit of X1 Oscillator
32.768
kHz
V
X1
X2
SS
CHAPTER 6 CLOCK GENERATOR
V
XT1
XT2
SS
User’s Manual U15947EJ3V1UD
External
clock
External
clock
(b) External clock
(b) External clock
X1
X2
XT1
XT2
DD
. In this case,
DD
139
. In