AT90USB1287 Atmel Corporation, AT90USB1287 Datasheet - Page 29
AT90USB1287
Manufacturer Part Number
AT90USB1287
Description
Manufacturer
Atmel Corporation
Specifications of AT90USB1287
Flash (kbytes)
128 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)
8
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
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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5.4
5.4.1
5.4.2
5.4.3
5.4.4
7593K–AVR–11/09
I/O Memory
General Purpose I/O Registers
General Purpose I/O Register 2 – GPIOR2
General Purpose I/O Register 1 – GPIOR1
General Purpose I/O Register 0 – GPIOR0
The I/O space definition of the AT90USB64/128 is shown in
All AT90USB64/128 I/Os and peripherals are placed in the I/O space. All I/O locations may be
accessed by the LD/LDS/LDD and ST/STS/STD instructions, transferring data between the 32
general purpose working registers and the I/O space. I/O Registers within the address range
0x00 - 0x1F are directly bit-accessible using the SBI and CBI instructions. In these registers, the
value of single bits can be checked by using the SBIS and SBIC instructions. Refer to the
instruction set section for more details. When using the I/O specific commands IN and OUT, the
I/O addresses 0x00 - 0x3F must be used. When addressing I/O Registers as data space using
LD and ST instructions, 0x20 must be added to these addresses. The AT90USB64/128 is a
complex microcontroller with more peripheral units than can be supported within the 64 location
reserved in Opcode for the IN and OUT instructions. For the Extended I/O space from 0x60 -
0xFF in SRAM, only the ST/STS/STD and LD/LDS/LDD instructions can be used.
For compatibility with future devices, reserved bits should be written to zero if accessed.
Reserved I/O memory addresses should never be written.
Some of the Status Flags are cleared by writing a logical one to them. Note that, unlike most
other AVRs, the CBI and SBI instructions will only operate on the specified bit, and can therefore
be used on registers containing such Status Flags. The CBI and SBI instructions work with reg-
isters 0x00 to 0x1F only.
The I/O and peripherals control registers are explained in later sections.
The AT90USB64/128 contains three General Purpose I/O Registers. These registers can be
used for storing any information, and they are particularly useful for storing global variables and
Status Flags. General Purpose I/O Registers within the address range 0x00 - 0x1F are directly
bit-accessible using the SBI, CBI, SBIS, and SBIC instructions.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
7
MSB
R/W
0
7
MSB
R/W
0
7
MSB
R/W
0
6
R/W
0
6
R/W
0
6
R/W
0
5
R/W
0
5
R/W
0
5
R/W
0
4
R/W
0
4
R/W
0
4
R/W
0
3
0
3
0
3
0
R/W
R/W
R/W
2
R/W
0
2
R/W
0
2
R/W
0
“Register Summary” on page
1
R/W
0
1
R/W
0
1
R/W
0
AT90USB64/128
0
LSB
R/W
0
0
LSB
R/W
0
0
LSB
R/W
0
GPIOR2
GPIOR1
GPIOR0
427.
29
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