ATmega644P Automotive Atmel Corporation, ATmega644P Automotive Datasheet - Page 293

• Manufacturer Part Number: ATmega644P Automotive
• 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

24.8.16
In
Table 24-13. Boot Size Configuration
Note:
Table 24-14. Read-While-Write Limit
Note:
Table 24-15.
Note:
See
Self-Programming.
7674F–AVR–09/09
BOOTSZ1
Section
Read-While-Write section (RWW)
No Read-While-Write section (NRWW)
Variable
PCMSB
PAGEMSB
ZPCMSB
ZPAGEMSB
PCPAGE
PCWORD
Table 24-13
“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
1. Z0: should be zero for all SPM commands, byte select for the LPM instruction.
ATmega644P Boot Loader Parameters
Read-While-Write Section” on page
BOOTSZ0
Explanation of different variables used in
through
1
0
1
0
PC[14:7]
PC[6:0]
14
7
Table
Boot Size
1024 words
2048 words
4096 words
512 words
24-15, the parameters used in the description of the Self-Programming are given.
Correspondi
Z-value
Z15:Z7
Z7:Z1
Z15
(1)
ng
Z8
(1)
Pages
16
32
4
8
280.
“NRWW – No Read-While-Write Section” on page 280
Application
Flash Section
0x0000 - 0xFDFF
0x0000 - 0xFBFF
0x0000 - 0xF7FF
0x0000 - 0xEFFF
Description
Most significant bit in the Program Counter. (The Program Counter is 15 bits
PC[14:0])
Most significant bit which is used to address the words within one page (128
words in a page requires seven bits PC [6:0]).
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
0xFE00 - 0x7FFF
0xFC00 - 0x7FFF
0xF800 - 0x7FFF
0xF000 - 0x7FFF
for details about the use of Z-pointer during
ATmega164P/324P/644P
282.
and the mapping to the Z-pointer
End Application
Section
0xFDFF
0xFBFF
0xF7FF
0xEFFF
Address
0x0000 - 0xEFFF
0xF000 - 0xFFFF
and
“RWW –
Boot Reset
Address
(Start Boot
Loader Section)
0xFE00
0xFC00
0xF800
0xF000
293