ATTINY461-20SUR Atmel, ATTINY461-20SUR Datasheet - Page 51

• Manufacturer Part Number: ATTINY461-20SUR
• Description: MCU AVR 4KB FLASH 20MHZ 20SOIC
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY461-20SUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Size: 4KB (2K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 256 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: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.2
9.2.1
2588E–AVR–08/10
External Interrupts
Low Level Interrupt
The External Interrupts are triggered by the INT0 or INT1 pin or any of the PCINT15:0 pins.
Observe that, if enabled, the interrupts will trigger even if the INT0, INT1 or PCINT15:0 pins are
configured as outputs. This feature provides a way of generating a software interrupt. Pin
change interrupts PCI will trigger if any enabled PCINT15:0 pin toggles. The PCMSK Register
control which pins contribute to the pin change interrupts. Pin change interrupts on PCINT15:0
are detected asynchronously. This implies that these interrupts can be used for waking the part
also from sleep modes other than Idle mode.
The INT0 and INT1 interrupts can be triggered by a falling or rising edge or a low level. This is
set up as indicated in the specification for the MCU Control Register – MCUCR. When the INT0
interrupt is enabled and is configured as level triggered, the interrupt will trigger as long as the
pin is held low. Note that recognition of falling or rising edge interrupts on INT0 or INT1 requires
the presence of an I/O clock, described in
A low level interrupt on INT0 is detected asynchronously. This means that the interrupt source
can be used for waking the part also from sleep modes other than Idle (the I/O clock is halted in
all sleep modes except Idle).
Note that if a level triggered interrupt is used for wake-up from Power-down, the required level
must be held long enough for the MCU to complete the wake-up to trigger the level interrupt. If
the level disappears before the end of the Start-up Time, the MCU will still wake up, but no inter-
0x0003
0x0004
0x0005
0x0006
0x0007
0x0008
0x0009
0x000A
0x000B
0x000C
0x000D
0x000E
0x000F
0x0010
0x0011
0x0012
0x0013
0x0014
0x0015
0x0016
0x0017
0x0018
...
RESET: ldi
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
ldi
out
out
sei
<instr>
...
TIM1_COMPA
TIM1_COMPB
TIM1_OVF
TIM0_OVF
USI_START
USI_OVF
EE_RDY
ANA_COMP
ADC
WDT
EXT_INT1
TIM0_COMPA
TIM0_COMPB
TIM0_CAPT
TIM1_COMPD
FAULT_PROTECTION ; Timer1 Fault Protection
r16, low(RAMEND) ; Main program start
r17, high(RAMEND); Tiny861 have also SPH
SPL, r16
SPH, r17
“Clock Subsystems” on page
; Timer1 CompareA Handler
; Timer1 CompareB Handler
; Timer1 Overflow Handler
; Timer0 Overflow Handler
; USI Start Handler
; USI Overflow Handler
; EEPROM Ready Handler
; Analog Comparator Handler
; ADC Conversion Handler
; WDT Interrupt Handler
; IRQ1 Handler
; Timer0 CompareA Handler
; Timer0 CompareB Handler
; Timer0 Capture Event Handler
; Timer1 CompareD Handler
; Set Stack Pointer to top of RAM
; Tiny861 have also SPH
; Enable interrupts
24.
51