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ATmega32A Datasheet(PDF) 237 Page - ATMEL Corporation |
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ATmega32A Datasheet(HTML) 237 Page - ATMEL Corporation |
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237 / 352 page  237 8155B–AVR–07/09 ATmega32A Control corresponds to the Data Direction – DD Register, and the Pull-up Enable – PUExn – cor- responds to logic expression PUD · DDxn · PORTxn. Digital alternate port functions are connected outside the dotted box in Figure 24-4 to make the scan chain read the actual pin value. For Analog function, there is a direct connection from the external pin to the analog circuit, and a scan chain is inserted on the interface between the digi- tal logic and the analog circuitry. Figure 24-3. Boundary-scan Cell for Bidirectional Port Pin with Pull-up Function. DQ DQ G 0 1 0 1 DQ DQ G 0 1 0 1 0 1 0 1 DQ DQ G 0 1 Port Pin (PXn) Vcc EXTEST To Next Cell ShiftDR Output Control (OC) Pullup Enable (PUE) Output Data (OD) Input Data (ID) From Last Cell UpdateDR ClockDR FF2 LD2 FF1 LD1 LD0 FF0 |
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