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Functionality
4.1.2 Hard Reset
A hard reset is generated from four possible sources:
• A main power-on reset
• A manual hard reset generated on the motherboard
• A debug port hard reset
• An internal source of the MPC821
When the open-drain HRESET signal is asserted, hard reset configuration data is driven on
the data bus by the motherboard logic. See Section 4.1.6.2 Hard Reset Configuration of
the MPC8xxFADS User's Manual for details.
4.1.3 Soft Reset
A soft reset is generated from three possible sources:
• The debug port controller on the motherboard
• A manual soft reset generated on the motherboard
• An internal source of the MPC821
The motherboard logic makes a soft reset configuration available to the MPC821 when a
soft reset is generated to the MPC821. See Section 4.1.6.2 Soft Reset Configuration of
the MPC8xxFADS User's Manual for details.
4.2 INTERRUPTS
The only external interrupt that is applied to the MPC821 via its interrupt controller is the
abort (NMI) interrupt, which is generated by a push-button and logic that resides on the
motherboard.
4.3 CLOCK GENERATOR
Although most of the clock generator logic is found on the daughterboard, it is explained in
detail in the motherboard manual since it is common to all daughterboards. See Section 4.3
Clock Generator of the MPC8xxFADS User's Manual for more information.
4.4 LCD PANEL SUPPORT
A dedicated LCD connector is provided with your board to allow connection to an LCD panel.
This connector contains the MPC821 Port D pins. The LCD connector is a superset of the
LCD connector on the MPC821FADS board, which makes it easy to move tools between
the two boards and to connect the additional color bits.
To make connecting even easier, there are 5V supply pins available on the LCD connector.
For a description of these signals, refer to Table 5-8 in Section 5 Signal Descriptions.
4-2
MPC821FADS-DB USER'S MANUAL
MOTOROLA
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