ATTINY26L-8SU Atmel, ATTINY26L-8SU Datasheet - Page 62

• Manufacturer Part Number: ATTINY26L-8SU
• Description: ID MCU AVR 2K 5V 8MHZ 20-SOIC
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY26L-8SU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Size: 2KB (1K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SOIC (7.5mm Width)
• Package: 20SOIC
• Device Core: AVR
• Family Name: ATtiny
• Maximum Speed: 8 MHz
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 16
• Interface Type: SPI/USI
• On-chip Adc: 11-chx10-bit
• Number Of Timers: 2
• Cpu Family: ATtiny
• Device Core Size: 8b
• Frequency (max): 8MHz
• Total Internal Ram Size: 128Byte
• # I/os (max): 16
• Number Of Timers - General Purpose: 2
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 20
• Package Type: SOIC
• Processor Series: ATTINY2x
• Core: AVR8
• Data Ram Size: 128 B
• Maximum Clock Frequency: 8 MHz
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• For Use With: ATSTK600-DIP40 - STK600 SOCKET/ADAPTER 40-PDIP770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPIATAVRISP2 - PROGRAMMER AVR IN SYSTEMATSTK505 - ADAPTER KIT FOR 14PIN AVR MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ATTINY26L-8SJ; ATTINY26L-8SJ

External
Interrupt
Pin Change
Interrupt
62
ATtiny26(L)
The External Interrupt is triggered by the INT0 pin. Observe that, if enabled, the interrupt will trig-
ger even if the INT0 pin is configured as an output. This feature provides a way of generating a
software interrupt. The External Interrupt can be triggered by a falling or rising edge, a pin
change, or a low level. This is set up as indicated in the specification for the MCU Control Regis-
ter – MCUCR. When the External Interrupt is enabled and is configured as level triggered, the
interrupt will trigger as long as the pin is held low.
The changed level is sampled twice by the Watchdog Oscillator clock, and if both these samples
have the required level, the MCU will wake up. The period of the Watchdog Oscillator is 1.0
(nominal) at 3.0V and 25°C. The frequency of the Watchdog Oscillator is voltage dependent as
shown in “Electrical Characteristics” on page 126.
The pin change interrupt is triggered by any change on any I/O pin of Port B and pins PA3, PA6,
and PA7, if the interrupt is enabled and alternate function of the pin does not mask out the inter-
rupt. The bit PCIE1 in GIMSK enables interrupt from pins PB[7:4], PA[7:6], and PA[3]. PCIE0
enables interrupt on digital pins PB[3:0].
The pin change interrupt is different from other interrupts in two ways. First, pin change interrupt
enable bits PCIE1 and PCIE0 also mask the flag if they are not set. The normal operation on
most interrupts is that the flag is always active and only the execution of the interrupt is masked
by the interrupt enable.
Secondly, please note that pin change interrupt is disabled for any pin that is configured as an
alternate function. For example, no pin change interrupt is generated from pins that are config-
ured as AREF, AIN0 or AIN1, OC1A, OC1A, OC1B, OC1B, XTAL1, or XTAL2 in a fuse selected
clock option, Timer0 clocking, or RESET function. See Table 30 for alternate functions which
mask the pin change interrupt and how the function is enabled. For example pin change inter-
rupt on the PB0 is disabled when USI Two-wire mode or USI Three-wire mode or
Timer/Counter1 inverted output compare is enabled.
If the interrupt is enabled, the interrupt will trigger even if the changing pin is configured as an
output. This feature provides a way of generating a software interrupt. Also observe that the pin
change interrupt will trigger even if the pin activity triggers another interrupt, for example the
external interrupt. This implies that one external event might cause several interrupts.
The value of the programmed fuse is “0” and unprogrammed is “1”. Each of the lines enables the
alternate function so “or” function of the lines enables the function.
1477K–AVR–08/10
µs