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ATmega128
Table 29. Overriding Signals for Alternate Functions in PA3..PA0
Signal
Name
PUOE
PUOV
DDOE
DDOV
PVOE
PVOV
DIEOE
DIEOV
DI
AIO
PA3/AD3
SRE
~( W R | ADA) ?
PORTA3 ? PUD
SRE
W R | ADA
SRE
A3 ? ADA | D3
OUTPUT ? W R
0
0
D3 INPUT
–
PA2/AD2
SRE
~( W R | ADA) ?
PORTA2 ? PUD
SRE
W R | ADA
SRE
A2? ADA | D2
OUTPUT ? W R
0
0
D2 INPUT
–
PA1/AD1
SRE
~( W R | ADA) ?
PORTA1 ? PUD
SRE
W R | ADA
SRE
A1 ? ADA | D1
OUTPUT ? W R
0
0
D1 INPUT
–
PA0/AD0
SRE
~( W R | ADA) ?
PORTA0 ? PUD
SRE
W R | ADA
SRE
A0 ? ADA | D0
OUTPUT ? W R
0
0
D0 INPUT
–
Alternate Functions of
The Port B pins with alternate functions are shown in Table 30 .
Port B
Table 30. Port B Pins Alternate Functions
Port Pin
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
Alternate Functions
OC2/OC1C (1) (Output Compare and P W M Output for Timer/Counter2 or Output
Compare and P W M Output C for Timer/Counter1)
OC1B (Output Compare and P W M Output B for Timer/Counter1)
OC1A (Output Compare and P W M Output A for Timer/Counter1)
OC0 (Output Compare and P W M Output for Timer/Counter0)
MISO (SPI Bus Master Input/Slave Output)
MOSI (SPI Bus Master Output/Slave Input)
SCK (SPI Bus Serial Clock)
SS (SPI Slave Select input)
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 P W M 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 P W M mode timer function.
73
2467X–AVR–06/11
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