ATMEGA644A-AU Atmel, ATMEGA644A-AU Datasheet - Page 64
![IC MCU AVR 64K FLASH 44TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA644A-AU
Manufacturer Part Number
ATMEGA644A-AU
Description
IC MCU AVR 64K FLASH 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644A-AU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K 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
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA644A-AU
Manufacturer:
Atmel
Quantity:
135
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8272A–AVR–01/10
When the BOOTRST Fuse is unprogrammed, the Boot section size set to 8K bytes and the
IVSEL bit in the MCUCR Register is set before any interrupts are enabled, the most typical and
general program setup for the Reset and Interrupt Vector Addresses is:
When the BOOTRST Fuse is programmed and the Boot section size set to 8K bytes, the most
typical and general program setup for the Reset and Interrupt Vector Addresses is:
164A/164PA/324A/324PA/644A/644PA/1284/1284P
0x0022
0x0024
0x0026
0x0028
0x002A
0x002C
0x002E
0x0030
0x0032
0x0034
0x0036
0x0038
0x003A
0x003C
;
0x003E
0x003F
0x0040
0x0041
0x0042
0x0043
...
Address Labels Code
0x00000 RESET: ldi
0x00001
0x00002
0x00003
0x00004
0x00005
;
.org 0x1F002
0x1F002
0x1F004
...
0x1FO36
Address Labels Code
.org 0x0002
0x00002
RESET:
...
out
ldi
out
sei
<instr>
jmp
jmp
...
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
jmp
ldi
out
ldi
out
sei
<instr>
...
r16,high(RAMEND); Main program start
SPH,r16
r16,low(RAMEND)
SPL,r16
EXT_INT0
EXT_INT1
...
SPM_RDY
EXT_INT0
xxx
Comments
TIM0_COMPB
TIM0_OVF
SPI_STC
USART0_RXC
USART0_UDRE
USART0_TXC
ANA_COMP
ADC
EE_RDY
TWI
SPM_RDY
USART1_RXC
USART1_UDRE
USART1_TXC
r16,
high(RAMEND)
SPH,r16
r16,
low(RAMEND)
SPL,r16
xxx
...
Comments
; Set Stack Pointer to top of RAM
; Enable interrupts
; IRQ0 Handler
; IRQ1 Handler
;
; SPM Ready Handler
; IRQ0 Handler
; Timer0 CompareB
; Timer0 Overflow
; SPI Transfer Complete
; USART0 RX Complete
; USART0,UDR Empty
; USART0 TX Complete
; Analog Comparator
; ADC Conversion Complete
; EEPROM Ready
; 2-wire Serial
; SPM Ready
; USART1 RX Complete
; USART1,UDR Empty
; USART1 TX Complete
; Main program start
; Set Stack Pointer to
top of RAM
; Enable interrupts
64
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