UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 138

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

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Figure 6-11 shows examples of incorrect resonator connection.
Caution When using the X1 oscillator and XT1 oscillator, wire as follows in the area enclosed by the
Remark When using the subsystem clock, replace X1 and X2 with XT1 and XT2, respectively. Also, insert
broken lines in the Figures 6-9 and 6-10 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 line
• Always make the ground point of the oscillator capacitor the same potential as V
• Do not fetch signals from the oscillator.
Note that the XT1 oscillator is designed as a low-amplitude circuit for reducing power
consumption.
resistors in series on the XT2 side.
through which a high fluctuating current flows.
ground the capacitor to a ground pattern through which a high current flows.
(a) Too long wiring
V
Figure 6-11. Examples of Incorrect Resonator Connection (1/2)
SS
X1
CHAPTER 6 CLOCK GENERATOR
X2
User’s Manual U17554EJ4V0UD
V
SS
(b) Crossed signal line
X1
PORT
X2
SS
. Do not