AT90CAN128
Table 39 and Table 40 relates the alternate functions of Port D to the overriding signals
shown in Figure 34 on page 67.
Table 39. Overriding Signals for Alternate Functions PD7..PD4
Signal Name
PUOE
PD7/T0
PD6/T1/RXCAN
PD5/XCK1/TXCAN
PD4/ICP1
0
0
0
0
0
0
RXCANEN
TXCANEN +
0
0
0
0
0
0
PUOV
PORTD6 • PUD
0
DDOE
RXCANEN
TXCANEN
DDOV
0
0
0
1
PVOE
TXCANEN + UMSEL1
PVOV
(XCK1 OUTPUT •
UMSEL1 • TXCANEN)
+ (TXCAN • TXCANEN)
PTOE
DIEOE
DIEOV
DI
0
0
0
0
0
0
0
0
0
0
0
0
T0 INPUT
T1 INPUT/RXCAN
XCK1 INPUT
ICP1 INPUT
AIO
–
–
–
–
Table 40. Overriding Signals for Alternate Functions in PD3..PD0(1)
Signal Name PD3/INT3/TXD1 PD2/INT2/RXD1
PD1/INT1/SDA
PD0/INT0/SCL
PUOE
PUOV
DDOE
DDOV
PVOE
PVOV
PTOE
DIEOE
DIEOV
DI
TXEN1
RXEN1
TWEN
TWEN
0
PORTD2 • PUD
PORTD1 • PUD PORTD0 • PUD
TXEN1
RXEN1
0
0
1
0
0
0
TXEN1
0
TWEN
TWEN
TXD1
0
SDA_OUT
0
SCL_OUT
0
0
0
INT3 ENABLE
INT3 ENABLE
INT3 INPUT
–
INT2 ENABLE
INT2 ENABLE
INT2 INPUT/RXD1
–
INT1 ENABLE
INT1 ENABLE
INT1 INPUT
SDA INPUT
INT0 ENABLE
INT0 ENABLE
INT0 INPUT
SCL INPUT
AIO
Note:
1. When enabled, the Two-wire Serial Interface enables Slew-Rate controls on the out-
put pins PD0 and PD1. This is not shown in this table. In addition, spike filters are
connected between the AIO outputs shown in the port figure and the digital logic of
the TWI module.
77
4250E–CAN–12/04
ATMEL [ ATMEL ]
