ATTIny2313-16MI ATMEL Corporation, ATTIny2313-16MI Datasheet - Page 51

• Manufacturer Part Number: ATTIny2313-16MI
• Description: 8-bit AVR Microcontroller with 2K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

Alternate Port Functions
2543C–AVR–12/03
Most port pins have alternate functions in addition to being general digital I/Os. Figure
25 shows how the port pin control signals from the simplified Figure 22 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 25. Alternate Port Functions
Note:
Table 24 summarizes the function of the overriding signals. The pin and port indexes
from Figure 25 are not shown in the succeeding tables. The overriding signals are gen-
erated 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.
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
Pxn, PORT TOGGLE OVERRIDE ENABLE
clk
pin.
I/O
, SLEEP, and PUD are common to all ports. All other signals are unique for each
1
0
1
0
1
0
1
0
PUOExn
PUOVxn
PVOExn
PVOVxn
DIEOExn
DIEOVxn
SLEEP
DDOExn
DDOVxn
(1)
PUD:
WDx:
RDx:
RRx:
WRx:
RPx:
clk
DIxn:
AIOxn:
SYNCHRONIZER
WPx:
D
L
I/O
CLR
SET
:
Q
Q
WRITE DDRx
WRITE PORTx
PULLUP DISABLE
READ DDRx
READ PORTx REGISTER
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
Q
Q
DDxn
CLR
CLR
D
D
ATtiny2313/V
1
0
clk
PUD
WDx
RDx
RRx
DIxn
AIOxn
RPx
I/O
WRx
PTOExn
WPx
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