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The D[15:0] bus includes bus holders to reduce the static power dissipation caused by
floating, unused pins. The bus holders also eliminate the need for external bias resistors
on unused pins. When the bus goes into a high-impedance state, the bus holders keep the
data bus at the logic level that was most recently driven. The bus holders are enabled at
reset and can be enabled/disabled through the External Bus Control Register (XBCR).
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