ATMEGA8515L8AU

Manufacturer Part NumberATMEGA8515L8AU
DescriptionTQFP44
ManufacturerATMEL Corporation
ATMEGA8515L8AU datasheet
 

Specifications of ATMEGA8515L8AU

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Page 67/257

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Alternate Functions Of Port B
2512J–AVR–10/06
Table 28. Overriding Signals for Alternate Functions in PA3..PA0
Signal
Name
PA3/AD3
PA2/AD2
PUOE
SRE
SRE
PUOV
~(WR | ADA) •
~(WR | ADA) •
PortA3
PortA2
DDOE
SRE
SRE
DDOV
WR | ADA
WR | ADA
PVOE
SRE
SRE
PVOV
A3 • ADA |
A2 • ADA |
D3 OUTPUT •
D2 OUTPUT •
WR
WR
DIEOE
0
0
DIEOV
0
0
DI
D3 INPUT
D2 INPUT
AIO
The Port B pins with alternate functions are shown in Table 29.
Table 29. Port B Pins Alternate Functions
Port Pin
Alternate Functions
PB7
SCK (SPI Bus Serial Clock)
PB6
MISO (SPI Bus Master Input/Slave Output)
PB5
MOSI (SPI Bus Master Output/Slave Input)
PB4
SS (SPI Slave Select Input)
PB3
AIN1 (Analog Comparator Negative Input)
PB2
AIN0 (Analog Comparator Positive Input)
PB1
T1 (Timer/Counter1 External Counter Input)
T0 (Timer/Counter0 External Counter Input)
PB0
OC0 (Timer/Counter0 Output Compare Match Output)
The alternate pin configuration is as follows:
• SCK – Port B, Bit 7
SCK: Master Clock output, Slave Clock input pin for SPI channel. When the SPI is
enabled as a Slave, this pin is configured as an input regardless of the setting of DDB7.
When the SPI is enabled as a Master, the data direction of this pin is controlled by
DDB7. When the pin is forced by the SPI to be an input, the pull-up can still be con-
trolled by the PORTB7 bit.
• MISO – Port B, Bit 6
MISO: Master Data input, Slave Data output pin for SPI channel. When the SPI is
enabled as a Master, this pin is configured as an input regardless of the setting of
DDB6. When the SPI is enabled as a Slave, the data direction of this pin is controlled by
DDB6. When the pin is forced by the SPI to be an input, the pull-up can still be con-
trolled by the PORTB6 bit.
ATmega8515(L)
PA1/AD1
PA0/AD0
SRE
SRE
~(WR | ADA) •
~(WR | ADA) •
PortA1
PortA0
SRE
SRE
WR | ADA
WR | ADA
SRE
SRE
A1 • ADA |
A0 • ADA |
D1 OUTPUT •
D0 OUTPUT •
WR
WR
0
0
0
0
D1 INPUT
D0 INPUT
67