HD404369 Datasheet, PDF (109/117 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer

HD404369 Series
Notes: 1. When using the subsystem oscillator (32.768 kHz), one of the following relationships for f_OSC
must be applied.
0.4 MHz ≤ f_OSC ≤ 1.0 MHz or 1.6 MHz ≤ f_OSC ≤ 5.0 MHz
The operating range for f_OSC can be set with bit 1 of system clock selection register 1 (SSR1:
$027).
2. The oscillation stabilization time is the period required for the oscillator to stabilize in the
following situations:
a. After V_CC reaches 2.7 V at power-on.
b. After RESET input goes low when stop mode is cancelled.
c. After STOPC input goes low when stop mode is cancelled.
To ensure the oscillation stabilization time at power-on or when stop mode is cancelled, RESET
or STOPC must be input for at least a duration of t_RC.
When using a crystal or ceramic oscillator, consult with the manufacturer to determine what
stabilization time is required, since it will depend on the circuit constants and stray capacitance.
3. Refer to figure 84.
4. Refer to figure 85.
5. Refer to figure 86.
6. Refer to figure 87.
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