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| MC68HC08LT8 Datasheet, PDF (52/156 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Oscillator (OSC)
From SIM
CONFIG2
STOP_XCLKEN
SIMOSCEN
CONFIG2
STOP_XTALEN
To all Modules
CGMXCLK
÷2
OSCXCLK
To LCD and PPI Modules
32KXCLK
MCU
OSC1
RB1
OSC2 XTAL1
X1
RS1*
RB2
XTAL2
X2
RS2*
C1 1â16MHz
C2
32.768 kHz
C3
C4
*RS can be zero (shorted) when used with higher-frequency crystals.
Refer to manufacturerâs data.
See Chapter 16 for component value requirements.
Figure 5-1. Oscillator External Connections
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.
5.3 I/O Signals
The following paragraphs describe the oscillator I/O signals.
5.3.1 Crystal Amplifier Input Pin (OSC1, XTAL1)
OSC1 and XTAL1 pin are input to the crystal oscillator amplifier. Schmitt trigger and glitch filter are
implemented on this pin in order to improve the EMC performance. See Chapter 16 Electrical
Specifications for detail specification of the glitch filter.
5.3.2 Crystal Amplifier Output Pin (OSC2 & XTAL2)
OSC2 or XTAL2 pin is the output of the crystal oscillator inverting amplifier.
5.3.3 Oscillator Enable Signal (SIMOSCEN)
The SIMOSCEN signal from the system integration module (SIM) enables/disables the x-tal oscillator
circuit.
MC68HC08LT8 Data Sheet, Rev. 1
52
Freescale Semiconductor
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