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| MC68HC908JB8 Datasheet, PDF (90/286 Pages) Motorola, Inc – MICROCONTROLLERS | |||
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Oscillator (OSC)
7.3 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 7-1. 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)
FROM SIM
TO USB
TO SIM
TO SIM
SIMOSCEN
MCU
OSC1
RB
CLOCK OSCXCLK
DOUBLER
OSCOUT
÷2
OSC2
X1
C1
RS*
* RS can be 0 (shorted) when used with
C2
higher frequency crystals.
Refer to manufacturerâs data.
Figure 7-1. Oscillator External Connections
Technical Data
90
MC68HC908JB8â¢MC68HC08JB8â¢MC68HC08JT8 â Rev. 2.3
Oscillator (OSC)
Freescale Semiconductor
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