AT90CAN128-16AE ATMEL Corporation, AT90CAN128-16AE Datasheet - Page 68

• Manufacturer Part Number: AT90CAN128-16AE
• Description: 8-bit Avr Microcontroller With 128K Bytes of Isp Flash And CAN Controller.flash (Kbytes) 128 Vcc (V) 2.7-5.5 EEPROM (Kbytes) 4 SRAM (bytes) 4K CAN (mess. Obj.) 15
• Manufacturer: ATMEL Corporation

Alternate Port Functions
68
AT90CAN128
Most port pins have alternate functions in addition to being general digital I/Os. Figure
33 shows how the port pin control signals from the simplified Figure 30 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 33. Alternate Port Functions
Note:
Table 28 summarizes the function of the overriding signals. The pin and port indexes
from Figure 33 are not shown in the succeeding tables. The overriding signals are gen-
erated internally in the modules having the alternate function.
Pxn
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. WRx, WPx, WDx, RRx, RPx, and RDx are common to all pins within the same port.
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
DDOExn
DDOVxn
PVOExn
PVOVxn
DIEOExn
DIEOVxn
SLEEP
(1)
SYNCHRONIZER
D
L
SET
CLR
Q
Q
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
1
0
clk
PUD
WDx
RDx
RRx
DIxn
AIOxn
RPx
I/O
WRx
4250C–CAN–03/04
PTOExn
WPx