atmega163l ATMEL Corporation, atmega163l Datasheet - Page 117

• Manufacturer Part Number: atmega163l
• Description: Atmega163 8-bit Avr Microcontroller With 16k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

Port B
The Port B Data Register –
PORTB
The Port B Data Direction
Register – DDRB
The Port B Input Pins Address
– PINB
1142E–AVR–02/03
Port B is an 8-bit bi-directional I/O port with internal pull-ups.
Three I/O memory address locations are allocated for Port B, one each for the Data
Register – PORTB, $18($38), Data Direction Register – DDRB, $17($37) and the Port B
Input Pins – PINB, $16($36). The Port B Input Pins address is read only, while the Data
Register and the Data Direction Register are read/write.
All port pins have individually selectable pull-up resistors. The Port B output buffers can
sink 20 mA and thus drive LED displays directly. When pins PB0 to PB7 are used as
inputs and are externally pulled low, they will source current if the internal pull-up resis-
tors are activated.
The Port B pins with alternate functions are shown in Table 45.
Table 45. Port B Pins Alternate Functions
When the pins are used for the alternate function, the DDRB and PORTB Registers
have to be set according to the alternate function description.
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
$18 ($38)
Read/Write
Initial Value
Bit
$17 ($37)
Read/Write
Initial Value
Bit
$16 ($36)
Read/Write
Initial Value
Port Pin
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PORTB7
PINB7
DDB7
R/W
R/W
N/A
R
7
0
7
0
7
Alternate Functions
T0 (Timer/Counter0 External Counter Input)
T1 (Timer/Counter1 External Counter Input)
AIN0 (Analog Comparator Positive Input)
AIN1 (Analog Comparator Negative Input)
SS (SPI Slave Select Input)
MOSI (SPI Bus Master Output/Slave Input)
MISO (SPI Bus Master Input/Slave Output)
SCK (SPI Bus Serial Clock)
PORTB6
PINB6
DDB6
R/W
R/W
N/A
6
0
6
0
6
R
PORTB5
PINB5
DDB5
R/W
R/W
N/A
R
5
0
5
0
5
PORTB4
PINB4
DDB4
R/W
R/W
N/A
R
4
0
4
0
4
PORTB3
PINB3
DDB3
R/W
R/W
N/A
R
3
0
3
0
3
PORTB2
PINB2
DDB2
R/W
R/W
N/A
2
0
2
0
2
R
ATmega163(L)
PORTB1
PINB1
DDB1
R/W
R/W
N/A
R
1
0
1
0
1
PORTB0
PINB0
DDB0
R/W
R/W
N/A
R
0
0
0
0
0
PORTB
DDRB
PINB
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