AT32UC3A0256AU Atmel Corporation, AT32UC3A0256AU Datasheet - Page 55

• Manufacturer Part Number: AT32UC3A0256AU
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A0256AU

• Flash (kbytes): 256 Kbytes
• Pin Count: 144
• Max. Operating Frequency: 66 MHz
• Cpu: 32-bit AVR
• # Of Touch Channels: 32
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 109
• Ext Interrupts: 109
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device + OTG
• Spi: 6
• Twi (i2c): 1
• Uart: 4
• Ssc: 1
• Ethernet: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 384
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 16
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 64
• Self Program Memory: YES
• External Bus Interface: 1
• Dram Memory: sdram
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0-3.6 or (1.65-1.95+3.0-3.6)
• Operating Voltage (vcc): 3.0-3.6 or (1.65-1.95+3.0-3.6)
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 10
• Output Compare Channels: 16
• Input Capture Channels: 6
• Pwm Channels: 13
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

32002F–03/2010
FCHK.S – Floating Point Check for Special Values
Description
Checks the floating point operand specified for the special values Infinity, Not-a-Number and
Denormal. A check is also performed for values with the two biggest possible representable
exponents, i.e. 0xFD and 0xFE. This is useful for avoiding overflow in intermediate calculations
in certain iterative algorithms. The operation sets the status flags according to the result of the
check, but does not affect the operand register.
Operation:
I.
Syntax:
I.
Operands:
I.
Status Flags:
Set flags depending on the value in the specified register
fchk.s Ry
y ∈ {0, 1, …, 15}
Q:
Predicate
Operand == NaN
Operand == Infinity
Operand ==
(Denormal or
(Exponent==0xFD) or
(Exponent==0xFE))
Operand == Normal
Not affected
Status register flag
values if predicate
true
C
N
V
Z
C
N
V
Z
C
N
V
Z
C
N
V
Z
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
0
0
1
0
0
0
0
1
1
1
0
0
0
0
0
0
Condition for
branch if
predicate true
lo
gt
eq
vs
Condition for
branch if
predicate false
gt
lo
ne
vc
AVR32
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