upd63a Renesas Electronics Corporation., upd63a Datasheet - Page 29

• Manufacturer Part Number: upd63a
• Description: 4-bit Single-chip Microcontroller For Infrared Remote Control Transmission
• Manufacturer: Renesas Electronics Corporation.

8. SYSTEM CLOCK OSCILLATION CIRCUIT
The system clock oscillation circuit consists of oscillation circuits for ceramic resonators (f
The system clock oscillation circuit stops its oscillation when reset or in STOP mode.
Caution When using the system clock oscillation circuit, wire area indicated by the dotted-line in the
diagram as follows to reduce the effects of the wiring capacitance, etc.
• Make the wiring as short as possible.
• Do not allow the wiring to intersect other signal lines. Do not wire close to lines through
• Make sure that the point where the oscillation circuit capacitor is installed is always at the
• Do not extract signals from the oscillation circuit.
which large fluctuating currents flow.
same electric potential as the ground. Never earth with a ground pattern through which large
currents flow.
Ceramic resonator
X
OUT
Figure 8-1. System Clock
PD63, 63A, 64
X
IN
GND
PD63, 63A, 64
X
= 2.4 to 8 MHz).
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