
74
2490R–AVR–02/2013
ATmega64(L)
Note:
1. ADA is short for ADdress Active and represents the time when address is output. See
“Exter-Alternate Functions of
Port B
The Port B pins with alternate functions are shown in
Table 30.Note:
1. OC1C not applicable in ATmega103 compatibility mode.
The alternate pin configuration is as follows:
OC2/OC1C, Bit 7
OC2, Output Compare Match output: The PB7 pin can serve as an external output for the
Timer/Counter2 Output Compare. The pin has to be configured as an output (DDB7 set (one)) to
serve this function. The OC2 pin is also the output pin for the PWM mode timer function.
OC1C, Output Compare Match C output: The PB7 pin can serve as an external output for the
Timer/Counter1 Output Compare C. The pin has to be configured as an output (DDB7 set (one))
to serve this function. The OC1C pin is also the output pin for the PWM mode timer function.
Table 29. Overriding Signals for Alternate Functions in PA3..
PA0(1) Signal
Name
PA3/AD3
PA2/AD2
PA1/AD1
PA0/AD0
PUOE
SRE
PUOV
~(WR | ADA)
PORTA3 PUD
~(WR | ADA)
PORTA2 PUD
~(WR | ADA)
PORTA1 PUD
~(WR | ADA)
PORTA0 PUD
DDOE
SRE
DDOV
WR | ADA
PVOE
SRE
PVOV
A3 ADA | D3
OUTPUT WR
A2 ADA | D2
OUTPUT WR
A1 ADA | D1
OUTPUT WR
A0 ADA | D0
OUTPUT WR
DIEOE
00
DIEOV
00
DI
D3 INPUT
D2 INPUT
D1 INPUT
D0 INPUT
AIO
––
Table 30. Port B Pins Alternate Functions
Port Pin
Alternate Functions
PB7
OC2/OC1C
(1) (Output Compare and PWM Output for Timer/Counter2 or Output
Compare and PWM Output C for Timer/Counter1)
PB6
OC1B (Output Compare and PWM Output B for Timer/Counter1)
PB5
OC1A (Output Compare and PWM Output A for Timer/Counter1)
PB4
OC0 (Output Compare and PWM Output for Timer/Counter0)
PB3
MISO (SPI Bus Master Input/Slave Output)
PB2
MOSI (SPI Bus Master Output/Slave Input)
PB1
SCK (SPI Bus Serial Clock)
PB0
SS (SPI Slave Select input)