AT94K05AL-25AJI Atmel, AT94K05AL-25AJI Datasheet - Page 119
AT94K05AL-25AJI
Manufacturer Part Number
AT94K05AL-25AJI
Description
IC FPSLIC 5K GATE 25MHZ 84PLCC
Manufacturer
Atmel
Series
FPSLIC®r
Specifications of AT94K05AL-25AJI
Core Type
8-bit AVR
Speed
25MHz
Interface
I²C, UART
Program Sram Bytes
4K-16K
Fpga Sram
2kb
Data Sram Bytes
4K ~ 16K
Fpga Core Cells
256
Fpga Gates
5K
Fpga Registers
436
Voltage - Supply
3 V ~ 3.6 V
Mounting Type
Surface Mount
Operating Temperature
-40°C ~ 85°C
Package / Case
84-PLCC
For Use With
ATSTK594 - BOARD FPSLIC DAUGHTER FOR STK500
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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1138I–FPSLI–1/08
Table 4-25.
Using the FMUL, FMULS and FMULSU instructions should not be more complex than the MUL,
MULS and MULSU instructions. However, one potential problem is to assign fractional variables
right values in a simple way. The fraction 0.75 (= 0.5 + 0.25) will, for example, be “0110 0000” if
8 bits are used.
To convert a positive fractional number in the range [0, 2> (for example 1.8125) to the format
used in the AVR, the following algorithm, illustrated by an example, should be used:
Is there a “1” in the number?
Yes, 1.8125 is higher than or equal to 1.
Is there a “0.5” in the rest?
Yes, 1.625 is higher than or equal to 1.
Byte is now “11xx xxxx”
Is there a “0.25” in the rest?
Yes, 1.25 is higher than or equal to 1.
Is there a “0.125” in the rest?
No, 0.5 is lower than 1.
Is there a “0.0625” in the rest?
Yes, 1 is higher than or equal to 1.
Bit Number
Byte is now “1xxx xxxx”
0.8125 / 0.5 = 1.625
0.625 / 0.5 = 1.25
Byte is now “111x xxxx”
0.25 / 0.5 = 0.5
Byte is now “1110 xxxx”
0.5 / 0.5 = 1
Byte is now “1110 1xxx”
7
6
5
4
3
2
1
0
Comparison of Integer and Fractional Formats
Unsigned Integer
Bit Significance
2
2
2
2
2
2
2
2
7
6
5
4
3
2
1
0
= 64
= 128
= 32
= 16
= 8
= 4
= 2
= 1
AT94KAL Series FPSLIC
Unsigned Fractional Number
Bit Significance
2
2
2
2
2
2
2
2
0
-1
-2
-3
-4
-5
-6
-7
= 1
= 0.0078125
= 0.5
= 0.25
= 0.125
= 0.0625
= 0.3125
= 0.015625
119
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