ATmega325PA Atmel Corporation, ATmega325PA Datasheet - Page 74

• Manufacturer Part Number: ATmega325PA
• Manufacturer: Atmel Corporation

14.3
8285D–AVR–06/11
Alternate Port Functions
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P
Most port pins have alternate functions in addition to being general digital I/Os.
shows how the port pin control signals from the simplified
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 microcontroller family.
Figure 14-5. Alternate Port Functions
Note:
Table 14-2 on page 75
indexes from
signals are generated internally in the modules having the alternate function.
PUOExn:
PUOVxn:
DDOExn:
DDOVxn:
PVOExn:
PVOVxn:
DIEOExn: Pxn DIGITAL INPUT-ENABLE OVERRIDE ENABLE
DIEOVxn: Pxn DIGITAL INPUT-ENABLE OVERRIDE VALUE
SLEEP:
PTOExn:
Pxn
1. WRx, WPx, WDx, RRx, RPx, and RDx are common to all pins within the same port. clk
Pxn, PORT TOGGLE OVERRIDE ENABLE
Pxn PULL-UP OVERRIDE ENABLE
Pxn PULL-UP OVERRIDE VALUE
Pxn DATA DIRECTION OVERRIDE ENABLE
Pxn DATA DIRECTION OVERRIDE VALUE
Pxn PORT VALUE OVERRIDE ENABLE
Pxn PORT VALUE OVERRIDE VALUE
SLEEP CONTROL
SLEEP, and PUD are common to all ports. All other signals are unique for each pin.
Figure 14-5 on page 74
summarizes the function of the overriding signals. The pin and port
1
0
1
0
1
0
1
0
PUOExn
PUOVxn
DIEOExn
DDOExn
DDOVxn
PVOExn
PVOVxn
DIEOVxn
SLEEP
(1)
are not shown in the succeeding tables. The overriding
PUD:
WDx:
RDx:
RRx:
WRx:
RPx:
WPx:
clk
DIxn:
AIOxn:
SYNCHRONIZER
D
L
I/O
SET
CLR
:
Q
Q
PULLUP DISABLE
WRITE DDRx
READ DDRx
READ PORTx REGISTER
WRITE PORTx
READ PORTx PIN
WRITE PINx
I/O CLOCK
DIGITAL INPUT PIN n ON PORTx
ANALOG INPUT/OUTPUT PIN n ON PORTx
D
PINxn
CLR
Q
Q
RESET
RESET
PORTxn
Q
Q
DDxn
Q
Q
Figure 14-2
CLR
CLR
D
D
1
0
clk
PUD
WDx
RRx
DIxn
AIOxn
RDx
RPx
I/O
can be overridden by
WRx
Figure 14-5
PTOExn
WPx
I/O
,
74