AT90USB647 Atmel Corporation, AT90USB647 Datasheet - Page 37
AT90USB647
Manufacturer Part Number
AT90USB647
Description
Manufacturer
Atmel Corporation
Specifications of AT90USB647
Flash (kbytes)
64 Kbytes
Pin Count
64
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
48
Ext Interrupts
16
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device + OTG
Spi
2
Twi (i2c)
1
Uart
1
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
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
4
Output Compare Channels
10
Input Capture Channels
1
Pwm Channels
9
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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5.5.9
7593K–AVR–11/09
Using all 64KB Locations of External Memory
Figure 5-10. Address Map with 32 KB External Memory
Since the External Memory is mapped after the Internal Memory as shown in
56KB of External Memory is available by default (address space 0x0000 to 0x20FF is reserved
for internal memory). However, it is possible to take advantage of the entire External Memory by
masking the higher address bits to zero. This can be done by using the XMMn bits and control
by software the most significant bits of the address. By setting Port C to output 0x00, and releas-
ing the most significant bits for normal Port Pin operation, the Memory Interface will address
0x0000 - 0x2FFF. See the following code examples.
Care must be exercised using this option as most of the memory is masked away.
ISRAM end + 0x8000
XMem start + 0x8000
0 x 0000
0 x 20FF
0 x 2100
0 x 7FFF
0 x 8000
0 x FFFF
I nternal M emory
AVR M emory M ap
E xternal
(U nused )
M emory
M emory C onfiguration A
E xternal 32K S RAM
0 x 0000
ISRAM end
XMem start
0 x 7FFF
AT90USB64/128
Figure
5-4, only
37
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