ATmega1284P Atmel Corporation, ATmega1284P Datasheet - Page 21

• Manufacturer Part Number: ATmega1284P
• Manufacturer: Atmel Corporation

Specifications of ATmega1284P

• 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: Yes
• 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

8.3.1
8272C–AVR–06/11
Data Memory Access Times
The 32 general purpose working registers, 64 I/O registers, 160 Extended I/O Registers and
t h e 1 0 2 4 / 2 0 4 8 / 4 0 9 6 b y t e s o f i n t e r n a l d a t a S R A M i n t h e
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P are all accessible through all these
addressing modes. The Register File is described in
13.
Figure 8-2.
This section describes the general access timing concepts for internal memory access. The
internal data SRAM access is performed in two clk
Figure 8-3.
Address
ATmega164A/PA/324A/PA/644A/PA/1284/P
clk
Data Memory Map for
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P
On-chip Data SRAM Access Cycles
Data
Data
WR
CPU
(1024/2048/4096/16384x 8)
RD
160 Ext I/O Reg.
64 I/O Registers
Data Memory
Internal SRAM
32 Registers
Compute Address
T1
Memory Access Instruction
0x0000 - 0x001F
0x0100
0x04FF/0x08FF/0x10FF /0x40FF
0x0020 - 0x005F
0x0060 - 0x00FF
Address valid
CPU
T2
”General Purpose Register File” on page
cycles as described in
Next Instruction
T3
Figure
8-3.
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