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Hodnocené. / 5. Na základě hodnocení zákazníků
Event Multitasking - 1
Event Multitasking
Event Multitasking was developed to give faster response to real time events. It is different than the multitasking that was
originally designed for business applications and later used in some industrial control languages.
Time Slice Multitasking – The Old W ay
This older form of multitasking usually takes two forms. The most popular is called “time slice.” Each task is written as
if it were a separate progr am. The first task starts and, on a clock tick (usually 60 times p er second), th at task is
suspended and the next task sta rts. After another clock tick, the second task is suspended and the third task begins. This
continues until all tasks have had their slice of time and the process starts over.
To get some idea of the performance level of this type of multitasking, assume that there are 10 equal tasks. Tasks are
switched 60 times per second. With 10 tasks, each task is serviced only 60/10 or 6 times per second.
The second form is really a version of the first. Tasks are switched after each command in each task. This increases the
task switching to several hundred times per second, but the switching overhead seriously slows the throughput.
The problem with time slice is that all the tasks are written in BASIC. Since there is only one microprocessor chip, and
task switching takes processor time away from progr am execution, the system will actually run slower than with a
non– multitasking program.
Event Multitasking – For Real Time Con trol
Event Multitasking in CAMBASIC solves the speed problem by compiling all tasks into machine code, which executes
much faster than BASIC. CAM BASIC executes about 3600 commands per second, which is very fast by BASIC
standards. It also can execute 5000 tasks per second in the background while maintaining the foreground rate!
NOTE: These numbers are half for 9 MHz systems.
There are some limitations to this method. You can only use the tasks defined by the language. These are:
Output Timing (PULSE)
Input Counting (COUNT)
Keypad (KEYPA D$)
Communications (COM$)
Hardware Interrupts (ITR)
Change of state on inputs (INP)
Periodic Interrupts (TICK)
A series of special commands are used for the tasks. You do not use CAMBASIC commands like POKE, GOTO, etc. for
the tasks.
Hardware vs Softw are Interrupts
It is important to understand the difference between hardware and software interrupts when dealing with a high level
language. CA MBASIC can respond to hardware interr upts, but only indirectly.
When a hardware interrupt occurs, an internal flag is set within a few microseconds. In the same manner, any task that
can cause an interrupt set an internal flag.
- COPYRIGHT 1
- TRADEMARKS 1
- HOW TO USE THIS MANUAL 2
- PRODUCT SUPPORT 3
- ABOUT CAMBASIC 4
- Getting Started 7
- Line Format 7
- Line Renumbering 7
- Line Labels 8
- Debugging 8
- Bit Manipulation 8
- Communications Ports 8
- Real time Multitasking 8
- Reserved Words 9
- Character Set 9
- Concepts - 11 17
- AND Operand 2 17
- Expression Evaluation 18
- CAMBASIC EDITOR 20
- LINE EDITING COMMANDS 21
- Other Tips 25
- Command Summary - 2 28
- Command Summary - 6 32
- CLEAR COM$ 50
- CLEAR COUNT 51
- CLEAR TICK 52
- CLEAR PULSE 53
- DEC & DECF 63
- DO/ENDDO 71
- DO/UNTIL 72
- DPEEK and DPOKE 73
- EXIT and EXIT CLEAR 79
- FOR / NEXT / STEP 83
- FPEEK and FPOKE 84
- IF / THEN / ELSE 90
- INC and INCF 91
- Commands - 62 95
- INPUT KEYPAD$ 96
- 106
- Commands - 73 106
- NEW and UNNEW 114
- ON COUNT 118
- ON ERR GOTO 119
- ON KEYPAD$ 122
- PEEK and POKE 127
- PEEK$ and POKE$ 128
- PRINT USING 131
- RESUME COUNT 141
- Commands - 114 147
- START BIT 153
- START COUNT 154
- START INP 155
- STOP BIT 157
- STOP COUNT 158
- STOP INP 159
- TRON/TROFF 168
- Commands - 139 172
- CONFIG AIN 174
- CONFIG BAUD 175
- CONFIG BREAK 177
- CONFIG CLOCK 178
- CONFIG COM$ 179
- CONFIG COUNT 180
- CONFIG DISPLAY 181
- CONFIG PIO 183
- PROGRAM DEBUGGING 184
- Error Messages - 3 188
- Event Multitasking 190
- COM$ TASKING 191
- COUNT MULTITASKING 192
- INP TASKING 196
- KEYPAD MULTITASKING 197
- Applications Examples 198
- Event Multitasking - 12 201
- MULTITASKING ON A CLOCK TICK 202
- PULSE MULTITASKING 203
- THE CAMBASIC MINI– MONITOR 207
Samsung HLR5087WX-XAA Handbücher
Bedienungsanleitungen und Benutzerhandbücher für Fernseher Samsung HLR5087WX-XAA.
Wir stellen 1 PDF-Handbücher Samsung HLR5087WX-XAA zum kostenlosen herunterladen nach Dokumenttypen zur Verfügung Bedienungsanleitung
Samsung HLR5087WX-XAA Bedienungsanleitung (104 Seiten)
Marke: Samsung | Kategorie: Televisions | Größe: 6.23 MB |
Inhaltsverzeichnis
English - 11
11
English - 17
17
Connections
19
Operation
31
English - 35
35
English - 41
41
English - 45
45
English - 51
51
English - 55
55
English - 67
67
English - 75
75
Auto Volume
77
English - 87
87
English - 89
89
English - 93
93
Special Features
100
Appendix
101
Specifications
103
BP68-00448A-01
104
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