ATmega644P Automotive Atmel Corporation, ATmega644P Automotive Datasheet - Page 14
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ATmega644P Automotive
Manufacturer Part Number
ATmega644P Automotive
Description
Manufacturer
Atmel Corporation
Specifications of ATmega644P Automotive
Flash (kbytes)
64 Kbytes
Pin Count
44
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
32
Ext Interrupts
32
Usb Speed
No
Usb Interface
No
Spi
3
Twi (i2c)
1
Uart
2
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
4
Eeprom (bytes)
2048
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 125
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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5.8.1
14
Atmel ATtiny24/44/84 [Preliminary]
Interrupt Response Time
When using the SEI instruction to enable interrupts, the instruction following SEI will be exe-
cuted before any pending interrupts, as shown in this example.
The interrupt execution response for all the enabled Atmel
cycles minimum. After four clock cycles the Program Vector address for the actual interrupt
handling routine is executed. During this four clock-cycle period, the program counter is
pushed onto the stack. The vector is normally a jump to the interrupt routine, and this jump
takes three clock cycles. If an interrupt occurs during execution of a multi-cycle instruction, this
instruction is completed before the interrupt is served. If an interrupt occurs when the MCU is
in sleep mode, the interrupt execution response time is increased by four clock cycles. This
increase comes in addition to the start-up time from the selected sleep mode.
A return from an interrupt handling routine takes four clock cycles. During these four clock
cycles, the program counter (two bytes) is popped back from the stack, the stack pointer is
incremented by two, and the I-bit in SREG is set.
Assembly Code Example
C Code Example
sei
sleep; enter sleep, waiting for interrupt
; note: will enter sleep before any pending
; interrupt(s)
_SEI(); /* set Global Interrupt Enable */
_SLEEP(); /* enter sleep, waiting for interrupt */
/* note: will enter sleep before any pending interrupt(s) */
; set Global Interrupt Enable
®
AVR
®
interrupts is four clock
7701E–AVR–02/11
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