NEC PD78214 - Manual (Page 87)

58
µ
PD78214 Sub-Series
(c) A varying high current flows too close to the signal
line.
(d) A current flows through the ground line of the
oscillator. (The potentials vary at points A, B, and C.)
(e) A signal is being drawn from the oscillator.
(2) At power-on or return from STOP mode, some time is required for the oscillation to settle. Generally, a crystal
requires a few milliseconds, and a ceramic resonator several hundreds of microseconds, for the oscillation
to settle.
The oscillation settling time is determined as described below. Ensure that sufficient time is allowed for the
oscillation to settle.
1 At power on : RESET input (reset period)
2 At return from STOP mode : (i) RESET input (reset period)
(ii) (Period in which the NMI signal is active) + (period specified for the timer
for automatic start)
X2
PD78214 µ
X1 V SS
High
current
X2
PD78214
µ
X1 V SS
High current
A B C
Pnm
V DD
X2
PD78214
µ
X1 V
SS