ATMEGA8535-16AU Atmel, ATMEGA8535-16AU Datasheet - Page 68
ATMEGA8535-16AU
Manufacturer Part Number
ATMEGA8535-16AU
Description
IC AVR MCU 8K 16MHZ 5V 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8535-16AU
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
Package
44TQFP
Device Core
AVR
Family Name
ATmega
Maximum Speed
16 MHz
Operating Supply Voltage
5 V
Data Bus Width
8 Bit
Number Of Programmable I/os
32
Interface Type
SPI/TWI/USART
On-chip Adc
8-chx10-bit
Number Of Timers
3
Processor Series
ATMEGA8x
Core
AVR8
Data Ram Size
512 B
Maximum Clock Frequency
16 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/JTAG770-1005 - ISP 4PORT FOR ATMEL AVR MCU JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPIATAVRISP2 - PROGRAMMER AVR IN SYSTEMATSTK500 - PROGRAMMER AVR STARTER KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA8535-16AU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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External Interrupts
MCU Control Register –
MCUCR
68
ATmega8535(L)
The External Interrupts are triggered by the INT0, INT1, and INT2 pins. Observe that, if
enabled, the interrupts will trigger even if the INT0..2 pins are configured as outputs.
This feature provides a way of generating a software interrupt. The External Interrupts
can be triggered by a falling or rising edge or a low level (INT2 is only an edge triggered
interrupt). This is set up as indicated in the specification for the MCU Control Register –
MCUCR and MCU Control and Status Register – MCUCSR. When the External Inter-
rupt is enabled and is configured as level triggered (only INT0/INT1), the interrupt will
trigger as long as the pin is held low. Note that recognition of falling or rising edge inter-
rupts on INT0 and INT1 requires the presence of an I/O clock, described in “Clock
Systems and their Distribution” on page 24. Low level interrupts on INT0/INT1 and the
edge interrupt on INT2 are detected asynchronously. This implies that these interrupts
can be used for waking the part also from sleep modes other than Idle mode. The I/O
clock is halted in all sleep modes except Idle mode.
Note that if a level triggered interrupt is used for wake-up from Power-down mode, the
changed level must be held for some time to wake up the MCU. This makes the MCU
less sensitive to noise. The changed level is sampled twice by the Watchdog Oscillator
clock. The period of the Watchdog Oscillator is 1 µs (nominal) at 5.0V and 25°C. The
frequency of the Watchdog Oscillator is voltage dependent as shown in “Electrical Char-
acteristics” on page 255. The MCU will wake up if the input has the required level during
this sampling or if it is held until the end of the start-up time. The start-up time is defined
by the SUT Fuses as described in “System Clock and Clock Options” on page 24. If the
level is sampled twice by the Watchdog Oscillator clock but disappears before the end
of the start-up time, the MCU will still wake up, but no interrupt will be generated. The
required level must be held long enough for the MCU to complete the wake up to trigger
the level interrupt.
The MCU Control Register contains control bits for interrupt sense control and general
MCU functions.
• Bit 3, 2 – ISC11, ISC10: Interrupt Sense Control 1 Bit 1 and Bit 0
The External Interrupt 1 is activated by the external pin INT1 if the SREG I-bit and the
corresponding interrupt mask in the GICR are set. The level and edges on the external
INT1 pin that activate the interrupt are defined in Table 35. The value on the INT1 pin is
sampled before detecting edges. If edge or toggle interrupt is selected, pulses that last
longer than one clock period will generate an interrupt. Shorter pulses are not guaran-
teed to generate an interrupt. If low level interrupt is selected, the low level must be held
until the completion of the currently executing instruction to generate an interrupt.
Table 35. Interrupt 1 Sense Control
• Bit 1, 0 – ISC01, ISC00: Interrupt Sense Control 0 Bit 1 and Bit 0
Bit
Read/Write
Initial Value
ISC11
0
0
1
1
ISC10
0
1
0
1
SM2
R/W
7
0
Description
The low level of INT1 generates an interrupt request.
Any logical change on INT1 generates an interrupt request.
The falling edge of INT1 generates an interrupt request.
The rising edge of INT1 generates an interrupt request.
R/W
SE
6
0
SM1
R/W
5
0
SM0
R/W
4
0
ISC11
R/W
3
0
ISC10
R/W
2
0
ISC01
R/W
1
0
ISC00
R/W
0
0
2502K–AVR–10/06
MCUCR
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