UPD78F0413GA-GAM-AX NEC, UPD78F0413GA-GAM-AX Datasheet - Page 120

• Manufacturer Part Number: UPD78F0413GA-GAM-AX
• Description: 8BIT UC, 32K FLASH, 1KB RAM, LCD
• Manufacturer: NEC

Specifications of UPD78F0413GA-GAM-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 30
• Ram Memory Size: 1024Byte
• Cpu Speed: 10MHz
• No. Of Timers: 8
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 32KB
• Oscillator Type: External, Internal

5.4 System Clock Oscillator
5.4.1 X1 oscillator
pins.
5.4.2 XT1 oscillator
120
An external clock can also be input. In this case, input the clock signal to the EXCLK pin.
Figure 5-10 shows an example of the external circuit of the X1 oscillator.
The X1 oscillator oscillates with a crystal resonator or ceramic resonator (2 to 10 MHz) connected to the X1 and X2
The XT1 oscillator oscillates with a crystal resonator (standard: 32.768 kHz) connected to the XT1 and XT2 pins.
Figure 5-11 shows an example of the external circuit of the XT1 oscillator.
Caution
(a) Crystal or ceramic oscillation
1. When using the X1 oscillator and XT1 oscillator, wire as follows in the area enclosed by the
Crystal resonator
or
ceramic resonator
Note that the XT1 oscillator is designed as a low-amplitude circuit for reducing power
consumption.
broken lines in the Figures 5-10 and 5-11 to avoid an adverse effect from wiring capacitance.
• Keep the wiring length as short as possible.
• Do not cross the wiring with the other signal lines. Do not route the wiring near a signal
• Always make the ground point of the oscillator capacitor the same potential as V
• Do not fetch signals from the oscillator.
line through which a high fluctuating current flows.
not ground the capacitor to a ground pattern through which a high current flows.
Figure 5-11. Example of External Circuit of XT1 Oscillator
Figure 5-10. Example of External Circuit of X1 Oscillator
V
X1
X2
SS
CHAPTER 5 CLOCK GENERATOR
User’s Manual U18698EJ1V0UD
(a) Crystal oscillation
32.768
kHz
V
XT1
XT2
SS
External clock
(b) External clock
EXCLK
SS
. Do