AT32UC3A3128 Atmel Corporation, AT32UC3A3128 Datasheet - Page 58

• Manufacturer Part Number: AT32UC3A3128
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A3128

• Flash (kbytes): 128 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: 110
• Ext Interrupts: 110
• Usb Transceiver: 1
• Usb Speed: Hi-Speed
• Usb Interface: Device + OTG
• Spi: 6
• Twi (i2c): 2
• Uart: 4
• Lin: 4
• Ssc: 1
• Sd / Emmc: 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): 128
• Self Program Memory: YES
• External Bus Interface: 1
• Dram Memory: sdram
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0 to 3.6
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 18
• Input Capture Channels: 12
• Pwm Channels: 12
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

32002F–03/2010
FRSQRTA.S – Floating Point Reciprocal Square Root Approximation
Description
Returns an approximation of the reciprocal of the square root of the operand. This can be used
as a starting point for iterative approximation algorithms. Also checks the operand 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 over-
flow in intermediate calculations in certain iterative algorithms. The operation sets the status
flags according to the result of this check.
Operation:
I.
Syntax:
I.
Operands:
I.
Status Flags:
Opcode:
31
1
15
0
0
Rd ← ApproximateSquareRootReciprocal(Ry);
Set flags depending on the value in Ry
frsqrta.s
{d, y} ∈ {0, 1, …, 15}
Q:
1
Predicate
Operand == NaN
Operand == Infinity
Operand ==
(Denormal or
(Exponent==0xFD) or
(Exponent==0xFE))
0
29
1
Not affected
28
0
0
Rd, Ry
0
Status register flag
values if predicate
true
C
N
V
Z
C
N
V
Z
C
N
V
Z
1
Rd
←
←
←
←
←
←
←
←
←
←
←
←
0
0
0
1
0
0
0
1
1
0
0
0
0
25
24
1
1
0
0
0
Condition for
branch if
predicate true
lo
gt
eq
1
0
20
0
0
19
1
Condition for
branch if
predicate false
gt
lo
ne
1
Ry
AVR32
1
0
16
1
58