ATmega1284 Atmel Corporation, ATmega1284 Datasheet - Page 294
ATmega1284
Manufacturer Part Number
ATmega1284
Description
Manufacturer
Atmel Corporation
Specifications of ATmega1284
Flash (kbytes)
128 Kbytes
Pin Count
44
Max. Operating Frequency
20 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)
16
Eeprom (bytes)
4096
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 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
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26.8.17
In
Table 26-16. Boot Size Configuration
Note:
Table 26-17. Read-While-Write Limit
Note:
Table 26-18. Explanation of different variables used in
Note:
See
Programming.
8272C–AVR–06/11
BOOTSZ1
Section
Read-While-Write section (RWW)
No Read-While-Write section (NRWW)
Variable
PCMSB
PAGEMSB
ZPCMSB
ZPAGEMSB
PCPAGE
PCWORD
Table 26-16
”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 (E)LPM instruction.
ATmega1284/ATmega1284P Boot Loader Parameters
Write Section” on page
BOOTSZ0
through
1
0
1
0
PC[15:7]
PC[6:0]
15
6
Table
Boot Size
1024 words
2048 words
4096 words
512 words
26-18, the parameters used in the description of the Self-Programming are given.
Corresponding
280.
Z-value
Z16:Z8
Z7:Z1
Z16
Z7
(1)
(1)
Pages
ATmega164A/PA/324A/PA/644A/PA/1284/P
16
32
4
8
”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 16 bits
PC[15:0])
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 26-3 on page 284
(1)
Figure 26-2 on page
Pages
480
32
Boot Loader
Flash Section
0xFE00 - 0xFFFF
0xFC00 - 0xFFFF
0xF800 - 0xFFFF
0xF000 - 0xFFFF
for details about the use of Z-pointer during Self-
282.
and the mapping to the Z-pointer
End Application
Section
0xFDFF
0xFBFF
0xF7FF
0xEFFF
Address
0x0000 - 0xEFFF
0xF000 - 0xFFFF
and
”RWW – Read-While-
Boot Reset
Address
(Start Boot
Loader Section)
0xFE00
0xFC00
0xF800
0xF000
294
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