at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 71

• Manufacturer Part Number: at90pwm81-16se
• Description: 8-bit Avr Microcontroller With 8k Bytes In- System Programmable Flash
• Manufacturer: ATMEL Corporation

10.3
7734M–AVR–03/10
Alternate Port Functions
Most port pins have alternate functions in addition to being general digital I/Os.
the port pin control signals from the simplified
overriding signals may not be present in all port pins, but the figure serves as a generic description appli-
cable to all port pins in the AVR microcontroller family.
Figure 10-5.
Note:
Table 10-2
are not shown in the succeeding tables. The overriding signals are generated internally in the modules
having the alternate function.
1. WRx, WPx, WDx, RRx, RPx, and RDx are common to all pins within the same port. clk
Pxn
summarizes the function of the overriding signals. The pin and port indexes from
PUD are common to all ports. All other signals are unique for each pin.
Alternate Port Functions
DIEOExn: Pxn DIGITAL INPUT-ENABLE OVERRIDE ENABLE
DIEOVxn: Pxn DIGITAL INPUT-ENABLE OVERRIDE VALUE
PUOExn: Pxn PULL-UP OVERRIDE ENABLE
DDOExn: Pxn DATA DIRECTION OVERRIDE ENABLE
DDOVxn: Pxn DATA DIRECTION OVERRIDE VALUE
PUOVxn: Pxn PULL-UP OVERRIDE VALUE
PVOExn: Pxn PORT VALUE OVERRIDE ENABLE
PVOVxn: Pxn PORT VALUE OVERRIDE VALUE
PTOExn: Pxn, PORT TOGGLE OVERRIDE ENABLE
SLEEP: SLEEP CONTROL
1
0
1
0
1
0
1
0
(1)
PUOExn
PUOVxn
DDOExn
DDOVxn
PVOExn
PVOVxn
DIEOExn
DIEOVxn
SLEEP
Figure 10-2
SYNCHRONIZER
D
L
SET
CLR
Q
Q
can be overridden by alternate functions. The
AIOxn: ANALOG INPUT/OUTPUT PIN n ON PORTx
PUD: PULLUP DISABLE
WDx: WRITE DDRx
WRx: WRITE PORTx
WPx: WRITE PINx
clk
DIxn: DIGITAL INPUT PIN n ON PORTx
RDx: READ DDRx
RRx: READ PORTx REGISTER
RPx: READ PORTx PIN
D
PINxn
I/O
CLR
: I/O CLOCK
Q
Q
RESET
RESET
PORTxn
Q
Q
Q
Q
DDxn
CLR
CLR
D
D
AT90PWM81
1
0
Figure 10-5
clk
PUD
WDx
RDx
RRx
DIxn
AIOxn
RPx
I/O
WRx
I/O
PTOExn
WPx
, SLEEP, and
Figure 10-5
shows how
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