Eurotech BRI ISDN Uživatelský manuál stáhnout pdf (Strana 36)

Am186

CC Microcontroller ISDN TA Reference Design Manual

2-18

RESCON Configuration

The RESCON register provides a way to make design-specific hardware

configuration information available to software. The RESCON register is read

from AD[0..15] during reset. Because the Am186CC communications controller

has weak internal pulldowns, the default value is logic Low. Setting a bit requires

a 10-kΩ pullup resistor. Figure 2-12 shows the RESCON register bits.

Figure 2-12. RESCON Register Bits

• Validation Board - Identifies if the board is a validation board.

• Board ID - Unique board identifier that is used to determine what features are

available to the software.

• 0 - Bits are reserved for future use.

• Panic Bit - Used by software to boot in a safe mode (not currently supported).

• TIP - Identifies the TIP board as being present in the system.

• Board Configuration - Identifies particular population option for the board.

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