ATTINY20-XU Atmel, ATTINY20-XU Datasheet - Page 49

• Manufacturer Part Number: ATTINY20-XU
• Description: MCU AVR 2KB FLASH 12MHZ 14TSSOP
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY20-XU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 12MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 12
• Program Memory Size: 2KB (1K x 16)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Processor Series: ATtiny
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: SPI, TWI
• Maximum Clock Frequency: 12 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 2
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

10.2.7
10.3
8235B–AVR–04/11
Alternate Port Functions
Program Example
The following code example shows how to set port B pin 0 high, pin 1 low, and define the port
pins from 2 to 3 as input with a pull-up assigned to port pin 2. The resulting pin values are read
back again, but as previously discussed, a nop instruction is included to be able to read back the
value recently assigned to some of the pins.
Note:
Most port pins have alternate functions in addition to being general digital I/Os. In
below is shown how the port pin control signals from the simplified
be overridden by alternate functions.
Assembly Code Example
...
; Define pull-ups and set outputs high
; Define directions for port pins
ldi
ldi
ldi
out
out
out
; Insert nop for synchronization
nop
; Read port pins
in
...
See
“Code Examples” on page
r16,(1<<PUEB2)
r17,(1<<PB0)
r18,(1<<DDB1)|(1<<DDB0)
PUEB,r16
PORTB,r17
DDRB,r18
r16,PINB
6.
Figure 10-2 on page 45
ATtiny20
Figure 10-6
can
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