M38203M4 Datasheet, PDF (283/344 Pages) Mitsubishi Electric Semiconductor – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
2.11 Oscillation circuit
2.11.4 Oscillation stabilizing time
In the oscillating circuit using ceramic resonators, the oscillation is unstable for a certain time when the
oscillation of the resonators starts.
The time required for stabilizing of oscillation is called oscillation stabilizing time.
An appropriate oscillation stabilizing time is required in accordance with the conditions of the oscillation
circuit in use. For oscillation stabilizing time, ask the resonator manufacturer for information.
(1) Oscillation stabilizing time at poweron
In the oscillating circuit using ceramic resonators, oscillation is unstable for a certain time immediately
after poweron. At reset release, the oscillation stabilizing time for approximately 8,000 cycles of XIN
input is automatically generated.
Figure 2.11.6 shows the oscillation stabilizing time at poweron.
qMiddle-/high-speed mode
VCC ^{2.5 V}
RESET
2 µs or more
XIN
Internal reset
Oscillation stabilizing time
Release internal reset state
Fig. 2.11.6 Oscillation stabilizing time at poweron
3820 GROUP USER’S MANUAL
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