ATMEGA261 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'ATMEGA261' PDF : 226 Pages View PDF
DI: Data Input in USI Three-wire mode. USI Three-wire mode does not override normal port
functions, so pin must be configure as an input for DI function.
SDA: Two-wire mode Serial Interface Data.
PCINT0: Pin Change Interrupt source 0.
Table 12-7 and Table 12-8 relate the alternate functions of Port A to the overriding signals
shown in Figure 12-5 on page 61.
Table 12-7. Overriding Signals for Alternate Functions in PA7..PA4
Signal
Name
PA7/ADC6/AIN0/
PCINT7
PA6/ADC5/AIN1/
PCINT6
PA5/ADC4/AIN2/
PCINT5
PA4/ADC3/ICP0/
PCINT4
PUOE
0
0
0
0
PUOV
0
0
0
0
DDOE 0
0
0
0
DDOV
0
0
0
0
PVOE
0
0
0
0
PVOV
0
0
0
0
PTOE
0
0
0
0
DIEOE
PCINT7 • PCIE +
ADC6D
PCINT6 • PCIE +
ADC5D
PCINT5 • PCIE +
ADC4D
PCINT4 • PCIE +
ADC3D
DIEOV ADC6D
ADC5D
ADC4D
ADC3D
DI
PCINT7
PCINT6
PCINT5
ICP0/PCINT4
AIO
ADC6, AIN0
ADC5, AIN1
ADC4, AIN2
ADC3
Table 12-8. Overriding Signals for Alternate Functions in PA3..PA0
Signal
Name
PA3/AREF/
PCINT3
PA2/ADC2/INT1/
USCK/SCL/PCINT2
PA1/ADC1/DO/
PCINT1
PA0/ADC0/DI/SDA/
PCINT0
PUOE
0
0
0
0
PUOV
0
0
0
0
DDOE 0
USI_TWO_WIRE • USIPOS 0
USI_TWO_WIRE •
USIPOS
DDOV
0
(USI_SCL_HOLD +
PORTB2) • DDB2 • USIPOS
0
(SDA + PORTB0) •
DDRB0 • USIPOS
PVOE
0
USI_TWO_WIRE • DDRB2 USI_THREE_WIRE USI_TWO_WIRE •
• USIPOS
DDRB0 • USIPOS
PVOV
0
0
DO • USIPOS
0
PTOE
0
USI_PTOE • USIPOS
0
0
DIEOE
PCINT3 • PCIE PCINT2 • PCIE + INT1 + PCINT1 • PCIE + PCINT0 • PCIE + ADC0D
ADC2D + USISIE • USIPOS ADC1D
+ USISIE • USIPOS
DIEOV 0
ADC2D
ADC1D
ADC0D
DI
PCINT3
USCK/SCL/INT1/ PCINT2 PCINT1
DI/SDA/PCINT0
AIO
AREF
ADC2
ADC1
ADC0
68 ATtiny261/ATtiny461/ATtiny861
7753E–AVR–06/10
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