UPD78F9418A NEC, UPD78F9418A Datasheet - Page 96

• Manufacturer Part Number: UPD78F9418A
• Description: (UPD7894xxA) 8-Bit Single Chip Microcontrollers
• Manufacturer: NEC

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5.4.3 Examples of incorrect resonator connection
96
Figure 5-7 shows examples of incorrect resonator connection.
Remark
(c) Wiring near high fluctuating current
When using the subsystem clock, read X1 and X2 as XT1 and XT2, respectively, and connect resistors
to the XT2 side in series.
V
V
V
V
(a) Too long wiring
SS0
SS1
SS0
SS1
,
,
Figure 5-7. Examples of Incorrect Resonator Connection (1/2)
X1
X1
X2
X2
CHAPTER 5 CLOCK GENERATOR
High current
User’s Manual U13952EJ3V0UD
(d) Current flowing through ground line of oscillator
V
V
(potential at points A, B, and C fluctuates)
SS0
SS1
A
,
X1
High current
B
(b) Crossed signal line
V
V
SS0
SS1
X2
,
C
(n = 0, 2, 4, 5, 6, 8, 9)
Pmn
X1
PORTn
X2
V
DD0
, V
DD1