ATmega32A Datasheet - Sunrom Technologies

ATmega32AControl corresponds to the Data Direction – DD Register, and the Pull-up Enable – PUExn – correspondsto logic expression PUD · DDxn · PORTxn.Digital alternate port functions are connected outside the dotted box in Figure 24-4 to make thescan chain read the actual pin value. For Analog function, there is a direct connection from theexternal pin to the analog circuit, and a scan chain is inserted on the interface between the digitallogic and the analog circuitry.Figure 24-3.Boundary-scan Cell for Bidirectional Port Pin with Pull-up Function.ShiftDR To Next CellEXTESTVccPullup Enable (PUE)001FF2LD2D Q D QG1Output Control (OC)01FF1LD1D Q D QG01Output Data (OD)0101FF0LD0D Q D QG01Port Pin (PXn)Input Data (ID)From Last CellClockDRUpdateDR8155C–AVR–02/11238