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D E M O 9 0 8 Q C 1 6
J U N E
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2 0 0 5
LOW VOLTAGE INHIBIT
The MC68HC908QC16 utilizes an internal Low Voltage Inhibit (LVI) protect against under-
voltage conditions. The LVI is enabled for low-voltage operation out of RESET. To use this
feature, the user should configure the LVI for high-voltage operation. Consult the MCU Device
User Guide for details on configuring LVI operation.
TIMING
The DEMO908QC16 has 2 timing sources available to the user. The internal oscillator oper-
ates at one of four, user selectable internal timing frequencies: 25.6MHz, 12.8 MHz, 8.0 MHz,
or 4.0 MHz. Out of reset, the internal oscillator is set to 4MHz with a frequency tolerance of
less than 25%. An 8-bit register allows trimming the internal oscillator to a tolerance of 0.4%.
Refer to the MC68HC908QC16 Device User Guide for details on internal oscillator operation.
An 8.0MHz crystal oscillator is also available as alternate timing source. The crystal in config-
ured for Pierce mode operation. An option jumper enables/disables the use of the external os-
cillator to the MCU. The external oscillator is connected to MCU inputs PTA5/OSC1 and
PTA4/OSC2 on the MCU. The user must configure the MCU for operation with the external
clock source. Refer to the MC68HC908QC16 Device User Guide for details.
Figure 5: OSC_EN Option Header
ON
Enables Clock Oscillator Input to MCU
1
2
OFF
Disables Clock Oscillator Input to MCU
COMMUNICATIONS
The DEMO908QC16 board provides a single Enhanced Serial Communications Interface
(ESCI) port. The ESCI port may be configured for RS-232 serial communications or for LIN
serial communications. RS-232 communications are supported through a DB9 connector. LIN
communications are supported through two, 4-pin Molex connectors.
The COM_SEL option header selects the communications protocol applied by the user.
LIN Communications
The DEMO908QC16 applies the MC33661D Local Interconnect Interface (LIN) physical layer
(PHY) for use in developing automotive control applications. The MC33661D PHY support LIN
bus functionality for input voltages between +7V and +18V. Only power applied to the PWR
connector will enable the LIN bus. The COM_SEL option header selects the LIN interface (see
COM_SEL above). Two, 4-pin, Molex connectors provide off-board connectivity. Figure 6
shows the pin-out for the LIN connectors and mating connector part numbers.
13
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