ATMEGA645A-AU Atmel, ATMEGA645A-AU Datasheet - Page 280

• Manufacturer Part Number: ATMEGA645A-AU
• Description: IC MCU AVR 64K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA645A-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 54
• 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: 64-TQFP
• Processor Series: ATmega
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: SPI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 54
• Number Of Timers: 3
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

25.8.14
Table 25-9.
Note:
Table 25-10. Read-While-Write Limit
Note:
Table 25-11. Explanation of different variables used in
Note:
280
BOOTSZ1
Section
Read-While-Write section (RWW)
No Read-While-Write section (NRWW)
Variable
PCMSB
PAGEMSB
ZPCMSB
ZPAGEMSB
PCPAGE
PCWORD
1
1
0
0
1. The different BOOTSZ Fuse configurations are shown in
1. For details about these two section, see
1. Z0: should be zero for all SPM commands, byte select for the LPM instruction.
ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/645
Boot Loader Parameters (ATmega325A/325PA/3250A/3250PA/625A/645P/6450A/6450P)
Write Section” on page
See
Programming.
BOOTSZ0
Boot Size Configuration
pointer
”Addressing the Flash During Self-Programming” on page 272
1
0
1
0
PC[13/14:6/7]
(1)
PC[5/6:0]
(ATmega325A/325PA/3250A/3250PA/625A/645P/6450A/6450P)
13/14
5/6
Boot Size
In
ming are given.
1024/2048 words
2048/4096 words
512/1024 words
256/512 words
Table 25-6
267.
Corresponding
(1)
Z14/15:Z7/8
(1)
ATmega325A/325PA/3250A/3250PA/625A/645P/6450A/6450P)
Z-value
Z6/7:Z1
Z14/15
through
(ATmega325A/325PA/3250A/3250PA/625A/645P/6450A/6450P)
Z6/7
Pages
16
32
4
8
”NRWW – No Read-While-Write Section” on page 267
Table
Application
Flash Section
0x0000-0x3EFF/
0x0000-0x7DFF
0x0000-0x3DFF/
0x0000-0x7BFF/
0x0000-0x3BFF/
0x0000-0x77FF
0x0000-0x37FF/
0x0000-0x6FFF
Most significant bit in the Program Counter. (Program Counter is 14/15 bits
PC[13/14:0])
Most significant bit which is used to address the words within one page
(64/128 words in a page requires six/seven bits PC [5/6:0]).
Bit in Z-register that is mapped to PCMSB. Because Z0 is not used, the
ZPCMSB equals PCMSB + 1.
Bit in Z-register that is mapped to PCMSB. Because Z0 is not used, the
ZPAGEMSB equals PAGEMSB + 1.
Program Counter page address: Page select, for Page Erase and Page
Write
Program Counter word address: Word select, for filling temporary buffer
(must be zero during Page Write operation)
25-8, the parameters used in the description of the Self-Program-
Figure 25-3
224/224
Pages
32/32
Figure 25-2
and the mapping to the Z-
for details about the use of Z-pointer during Self-
Boot Loader
Flash Section
0x3F00-0x3FFF/
0x7E00-0x7FFF
0x3E00-0x3FFF/
0x7C00-0x7FFF
0x3C00-0x3FFF/
0x7800-0x7FFF
0x3800-0x3FFF/
0x7000-0x7FFF
Address
0x0000 - x37FF/ 0x0000 - 0x6FFF
0x3800 - 0x3FFF/ 0x7000-0x7FFF
Description
End
Application
Section
0x3EFF/
0x7DFF
0x3DFF/
0x7BFF
0x3BFF/
0x77FF
0x37FF/
0x6FFF
and
”RWW – Read-While-
Boot Reset
Address
(Start Boot
Loader Section)
0x3F00/
0x7E00
0x3E00/
0x7C00
0x3C00/
0x7800
0x3800/
0x7000
8285B–AVR–03/11