Datasheet

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-
nal Memory Interface” on page 27 for details.
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 SRE SRE SRE
PUOV
~(WR | ADA) •
PORTA3 • PUD
~(WR | ADA) •
PORTA2 • PUD
~(WR | ADA) •
PORTA1 • PUD
~(WR | ADA) •
PORTA0 • PUD
DDOE
SRE SRE SRE SRE
DDOV
WR | ADA WR | ADA WR | ADA WR | ADA
PVOE
SRE SRE SRE SRE
PVOV
A3 • ADA | D3
OUTPUT • WR
A2• ADA | D2
OUTPUT • WR
A1 • ADA | D1
OUTPUT • WR
A0 • ADA | D0
OUTPUT • WR
DIEOE
0000
DIEOV
0000
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)