MC68HC908JL8 MOTOROLA [Motorola, Inc], MC68HC908JL8 Datasheet - Page 115

• Manufacturer Part Number: MC68HC908JL8
• Description: Motorola reserves the right to make changes without further notice to any products herein
• Manufacturer: MOTOROLA [Motorola, Inc]

8.5.2 Crystal Amplifier Output Pin (OSC2/RCCLK/PTA6/KBI6)
8.5.3 Oscillator Enable Signal (SIMOSCEN)
8.5.4 XTAL Oscillator Clock (XTALCLK)
8.5.5 RC Oscillator Clock (RCCLK)
8.5.6 Oscillator Out 2 (2OSCOUT)
MC68HC908JL8
MOTOROLA
—
Rev. 2.0
For the XTAL oscillator, OSC2 pin is the output of the crystal oscillator
inverting amplifier.
For the RC oscillator, OSC2 pin can be configured as a general purpose
I/O pin PTA6, or the output of the RC oscillator, RCCLK.
The SIMOSCEN signal comes from the system integration module (SIM)
and enables/disables the XTAL oscillator circuit or the RC-oscillator.
XTALCLK is the XTAL oscillator output signal. It runs at the full speed of
the crystal (f
Figure 8-2
OSC2 and may not represent the actual circuitry. The duty cycle of
XTALCLK is unknown and may depend on the crystal and other external
factors. Also, the frequency and amplitude of XTALCLK can be unstable
at start-up.
RCCLK is the RC oscillator output signal. Its frequency is directly
proportional to the time constant of the external R and C.
shows only the logical relation of RCCLK to OSC1 and may not
represent the actual circuitry.
2OSCOUT is same as the input clock (XTALCLK or RCCLK). This signal
is driven to the SIM module.
Freescale Semiconductor, Inc.
For More Information On This Product,
Oscillator
XTAL
RC
shows only the logical relation of XTALCLK to OSC1 and
XCLK
Go to: www.freescale.com
Oscillator (OSC)
) and comes directly from the crystal oscillator circuit.
Controlled by PTA6EN bit in PTAPUE ($000D)
PTA6EN = 0: RCCLK output
PTA6EN = 1: PTA6/KBI6
OSC2 pin function
Inverting OSC1
Figure 8-3
Oscillator (OSC)
Technical Data
I/O Signals
115