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ATMEGA16-16PC Datasheet(PDF) 52 Page - ATMEL Corporation |
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ATMEGA16-16PC Datasheet(HTML) 52 Page - ATMEL Corporation |
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52 / 315 page  52 ATmega16(L) 2466E–AVR–10/02 Alternate Port Functions Most port pins have alternate functions in addition to being General Digital I/Os. Figure 26 shows how the port pin control signals from the simplified Figure 23 can be overrid- den by alternate functions. The overriding signals may not be present in all port pins, but the figure serves as a generic description applicable to all port pins in the AVR micro- controller family. Figure 26. Alternate Port Functions (1) Note: 1. WPx, WDx, RRx, RPx, and RDx are common to all pins within the same port. clkI/O, SLEEP, and PUD are common to all ports. All other signals are unique for each pin. Table 21 summarizes the function of the overriding signals. The pin and port indexes from Figure 26 are not shown in the succeeding tables. The overriding signals are gen- erated internally in the modules having the alternate function. clk RPx RRx WPx RDx WDx PUD SYNCHRONIZER WDx: WRITE DDRx WPx: WRITE PORTx RRx: READ PORTx REGISTER RPx: READ PORTx PIN PUD: PULLUP DISABLE clk I/O: I/O CLOCK RDx: READ DDRx D L Q Q SET CLR 0 1 0 1 0 1 DIxn AIOxn DIEOExn PVOVxn PVOExn DDOVxn DDOExn PUOExn PUOVxn PUOExn: Pxn PULL-UP OVERRIDE ENABLE PUOVxn: Pxn PULL-UP OVERRIDE VALUE DDOExn: Pxn DATA DIRECTION OVERRIDE ENABLE DDOVxn: Pxn DATA DIRECTION OVERRIDE VALUE PVOExn: Pxn PORT VALUE OVERRIDE ENABLE PVOVxn: Pxn PORT VALUE OVERRIDE VALUE DIxn: DIGITAL INPUT PIN n ON PORTx AIOxn: ANALOG INPUT/OUTPUT PIN n ON PORTx RESET RESET Q Q D CLR Q Q D CLR Q Q D CLR PINxn PORTxn DDxn 0 1 DIEOVxn SLEEP DIEOExn: Pxn DIGITAL INPUT-ENABLE OVERRIDE ENABLE DIEOVxn: Pxn DIGITAL INPUT-ENABLE OVERRIDE VALUE SLEEP: SLEEP CONTROL Pxn I/O |
Similar Part No. - ATMEGA16-16PC |
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