8.3.3 Bus-Hold Circuitry

Active bus-hold circuitry holds unused or undriven data inputs at a valid logic state, which helps with board space savings and reduced component costs. Use of pull-up or pull-down resistors with the bus-hold circuitry is not recommended. See the Bus-Hold Circuit application note for more details. (SCLA015).

Note that the bus-hold circuitry always remains active when the corresponding supply is present (i.e. B port bus-hold circuits are active when V_CCB is present, and A port bus-hold circuits are active when V_CCA is present). The bus hold circuitry is also active even when the device is in a partial power down state or when the output enable pin is used to place all outputs into high impedance.