ATMEGA644P-A15MZ Atmel, ATMEGA644P-A15MZ Datasheet - Page 292

• 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

24.8.15
In
Table 24-10. Boot Size Configuration
Note:
Table 24-11. Read-While-Write Limit
Note:
Table 24-12. Explanation of different variables used in
Note:
See
Self-Programming.
292
BOOTSZ1
Section
Read-While-Write section (RWW)
No Read-While-Write section (NRWW)
Variable
PCMSB
PAGEMSB
ZPCMSB
ZPAGEMSB
PCPAGE
PCWORD
Table 24-7
“Addressing the Flash During Self-Programming” on page 284
1
1
0
0
1. The different BOOTSZ Fuse configurations are shown in
1. For details about these two section, see
Z0: should be zero for all SPM commands, byte select for the LPM instruction.
ATmega164P/324P/644P
ATmega324P Boot Loader Parameters
Read-While-Write Section” on page
through
BOOTSZ0
1
0
1
0
PC[13:6]
PC[5:0]
13
Table
6
Boot Size
1024 words
2048 words
256 words
512 words
24-9, the parameters used in the description of the Self-Programming are given.
Corresponding
Z-value
Z14:Z7
Z6:Z1
Z14
(1)
Z7
(1)
Pages
16
32
4
8
280.
“NRWW – No Read-While-Write Section” on page 280
Application
Flash Section
0x0000 - 0x3EFF
0x0000 - 0x1DFF
0x0000 - 0x1BFF
0x0000 - 0x37FF
Description
Most significant bit in the Program Counter. (The Program Counter is 14 bits
PC[13:0])
Most significant bit which is used to address the words within one page (128
words in a page requires seven bits PC [5:0]).
Bit in Z-pointer that is mapped to PCMSB. Because Z0 is not used, the
ZPCMSB equals PCMSB + 1.
Bit in Z-pointer 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)
Figure 24-3 on page 284
(1)
Figure 24-2 on page
Pages
224
32
Boot Loader
Flash Section
0x3F00 - 0x3FFF
0x3E00 - 0x3FFF
0x3C00 - 0x3FFF
0x3800 - 0x3FFF
for details about the use of Z-pointer during
282.
and the mapping to the Z-pointer
End
Application
Section
0x3EFF
0x3DFF
0x3BFF
0x37FF
Address
0x0000 - 0x37FF
0x3800 - 0x3FFF
and
“RWW –
Boot Reset
Address
(Start Boot
Loader Section)
0x3F00
0x3E00
0x3C00
0x3800
7674F–AVR–09/09