ATMEGA644P-A15MZ Atmel, ATMEGA644P-A15MZ Datasheet - Page 62

• Manufacturer Part Number: ATMEGA644P-A15MZ
• Description: MCU AVR 64KB FLASH 16MHZ 44QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644P-A15MZ

• Package / Case: 44-VQFN Exposed Pad
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Number Of I /o: 32
• Eeprom Size: 2K x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Program Memory Size: 64KB (64K x 8)
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Connectivity: I²C, SPI, UART/USART
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

62
ATmega164P/324P/644P
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:
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
RESET:
...
out
ldi
out
sei
<instr>
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
xxx
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
; 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
7674F–AVR–09/09