51
ATtiny15L
1187E–AVR–06/02
I/O Port B All AVR ports have true read-modify-write functionality when used as general digital I/O
ports. This means that the direction of one port pin can be changed without unintention-
ally changing the direction of any other pin with the SBI and CBI instructions. The same
applies for changing drive value (if configured as output) or enabling/disabling of pull-up
resistors (if configured as input).
Port B is a 6-bit bi-directional I/O port.
Three data memory address locations are allocated for Port B, one each for the Data
Register – PORTB, $18, Data Direction Register – DDRB, $17, and the Port B Input
Pins – PINB, $16. The Port B Input Pins address is read-only, while the Data Register
and the Data Direction Register are read/write.
Ports PB5..0 have special functions as described in the section “Pin Descriptions” on
page 4. If PB5 is not configured as External Reset, it is input with no pull-up or as an
open-drain output. All I/O pins have individually selectable pull-ups, which can be over-
ridden with pull-up disable.
The Port B output buffers on PB0 to PB4 can sink 20 mA and thus drive LED displays
directly. PB5 can sink 12 mA. When pins PB0 to PB4 are used as inputs and are exter-
nally pulled low, they will source current (I
IL
) if the internal pull-ups are activated.
Alternative Functions of
Port B
In ATtiny15L four Port B pins – PB2, PB3, PB4, and PB5 – have alternative functions as
inputs for the ADC. If some Port B pins are configured as outputs, it is essential that
these do not switch when a conversion is in progress. This might corrupt the result of the
conversion. During Power-down mode and ADC Noise Reduction mode, the Schmitt
triggers of the digital inputs are disconnected on these pins. This allows an analog input
voltage close to V
CC
/2 to be present during Power-down without causing excessive
power consumption. The Port B pins with alternate functions are shown in Table 1 on
page 4.
When the pins PB4..0 are used for the alternate function, the DDRB and PORTB Regis-
ters have to be set according to the alternate function description. When PB5 is used as
External Reset pin, the values in the corresponding DDRB and PORTB bit are ignored.
The Port B Data Register –
PORTB
The Port B Data Direction
Register – DDRB
The Port B Input Pins Address
– PINB
The Port B Input Pins address (PINB) is not a register, and this address enables access
to the physical value on each Port B pin. When reading PORTB, the PORTB Data Latch
is read, and when reading PINB, the logical values present on the pins are read.
Bit 76543210
$18
–––PORTB4 PORTB3 PORTB2 PORTB1 PORTB0 PORTB
Read/Write R R R R/W R/WS R/W R/W R/W
InitialValue00000000
Bit 76543210
$17 ––DDB5 DDB4 DDB3 DDB2 DDB1 DDB0 DDRB
Read/Write R R R/W R/W R/W R/W R/W R/W
InitialValue00000000
Bit 76543210
$16 ––PINB5 PINB4 PINB3 PINB2 PINB1 PINB0 PINB
Read/Write R R R RRRRR
Initial Value 0 0 N/A N/A N/A N/A N/A N/A
(18 pages)
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