UPD784938 Datasheet, PDF (113/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 4 CLOCK GENERATOR
Figure 4-7. Incorrect Example of Resonator Connection
(a) Wiring of connected circuits is too long
µ PD784938
(b) Crossed signal lines
µPD784938
Pnm
X2
X1
VSS
X2
X1
VSS
(c) Wiring near high fluctuating current
µPD784938
X2
High
fluctuating
current
X1
VSS
(e) Signal extracted
µPD784938
X2
X1
VSS
(d) Current flowing through ground line of
oscillator
(Potentials at points A, B, and C fluctuate)
VDD
µPD784938
Pnm
X2
X1
VSS
A
B
C
High current
Preliminary User’s Manual U13987EJ1V0UM00
113