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| MC68HC08BD24 Datasheet, PDF (102/244 Pages) Motorola, Inc – HCMOS Microcontroller Unit | |||
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8.3 Oscillator External Connections
In its typical configuration, the oscillator requires five external
components. The crystal oscillator is normally connected in a Pierce
oscillator configuration, as shown in Figure 8-1. This figure shows only
the logical representation of the internal components and may not
represent actual circuitry. The oscillator configuration uses five
components:
⢠Crystal, X1
⢠Fixed capacitor, C1
⢠Tuning capacitor, C2 (can also be a fixed capacitor)
⢠Feedback resistor, RB
⢠Series resistor, RS (optional)
The series resistor (RS) is included in the diagram to follow strict Pierce
oscillator guidelines and may not be required for all ranges of operation,
especially with high frequency crystals. Refer to the crystal
manufacturerâs data for more information.
From
SIM
To SIM
To SIM
SIMOSCEN
OSCXCLK
÷ 2 OSCOUT
MCU
OSC1
OSC2
RB
Technical Data
102
RS*
X1
C1
C2
*RS can be zero (shorted) when used with
higher-frequency crystals. Refer to manufacturerâs data.
Figure 8-1. Oscillator External Connections
MC68HC08BD24 â Rev. 1.1
Freescale Semiconductor
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