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MC908QY1VFQE Datasheet(PDF) 93 Page - Freescale Semiconductor, Inc

No. de pieza MC908QY1VFQE
Descripción Electrónicos  Microcontrollers
Download  184 Pages
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Fabricante Electrónico  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC908QY1VFQE Datasheet(HTML) 93 Page - Freescale Semiconductor, Inc

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Oscillator Module Signals
MC68HC908QY/QT Family Data Sheet, Rev. 5
Freescale Semiconductor
93
11.3.4 RC Oscillator
The RC oscillator circuit is designed for use with an external resistor (REXT) to provide a clock source with
a tolerance within 25% of the expected frequency. See Figure 11-3.
The capacitor (C) for the RC oscillator is internal to the MCU. The REXT value must have a tolerance of
1% or less to minimize its effect on the frequency.
In this configuration, the OSC2 pin can be left in the reset state as PTA4. Or, the OSC2EN bit in the port
A pullup enable register can be set to enable the OSC2 output function on the pin. Enabling the OSC2
output slightly increases the external RC oscillator frequency, fRCCLK.
Figure 11-3. RC Oscillator External Connections
11.4 Oscillator Module Signals
The following paragraphs describe the signals that are inputs to and outputs from the oscillator module.
11.4.1 Crystal Amplifier Input Pin (OSC1)
The OSC1 pin is either an input to the crystal oscillator amplifier, an input to the RC oscillator circuit, or
an external clock source.
For the internal oscillator configuration, the OSC1 pin can assume other functions according to Table 1-3.
Function Priority in Shared Pins.
MCU
REXT
SIMOSCEN
OSC1
EXTERNAL RC
OSCILLATOR
EN
RCCLK
÷ 2
BUSCLKX2
BUSCLKX4
TO SIM
FROM SIM
VDD
PTA4
I/O
1
0
PTA4
OSC2EN
PTA4/BUSCLKX4 (OSC2)
TO SIM
See Chapter 16 Electrical Specifications for component value requirements.
0
1
INTCLK
OSCRCOPT


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