~~NOTOC~~

====== OSA : Memory usage ======

These tables allow you to predict average ROM and RAM usage so that you can choose an appropriate microcontroller for your project. 


^  Р�Р�Р�РиР�С�С�Р�С�   ^  min, ROM/RAM  ^  normal, ROM/RAM  ^  full, ROM/RAM  ^  Bytes per task*, RAM  ^
| \\ **PIC10 (PIC12)** |||||
| Hi-tech PICC            |   153 / 11   |   250 / 14    |   363 / 14       |   2  |
| \\ **PIC16 (PIC12)** |||||
| HT-PICC STD             |   152 / 8    |   258 / 11    |   396 / 13       |   3  |
| HT-PICC PRO (PIC1xF1xxx)|   169 / 6   |    291 / 10    |   385 / 10       |   3  |
| microC PRO              |   180 / 14   |   307 / 17    |   474 / 17       |   3  |
| CCS PICC                |   254 / ..   |   399 / ..    |   573 / ..       |   3  |
| \\ **PIC18** |||||
| HT-PICC18 STD           |   336 / 7    |   548 / 10    |   982 / 16       |   3  |
| MPLAB C18               |   598 / 7    |   862 / 10    |  1214 / 16       |   4  |
| microC PRO              |   426 / 11   |   746 / 16    |  1136 / 17       |   3  |
| CCS PICC                |   436 / ..   |   696 / ..    |  1046 / ..       |   3  |
| \\ **PIC24 (dsPIC)**  |||||
| MPLAB C30               |   846 / 10   |  1065 / 16    |  1305 / 16       |  20  |
| \\ **AVR**       |||||
| WinAVR                  |   602 / 8    |  1030 / 13    |  1348 / 15       |  10  |
| IAR                     |   550 / 8    |   958 / 13    |  1108 / 15       |   5  |
| \\ **STM8**      |||||
| Cosmic                  |   462 / 8    |   729 / 13    |   974 / 15       |   5  |
| IAR                     |   664 / 8    |  1053 / 13    |  1388 / 15       |  13  |
| Raisonance              |   434 / 8    |   709 / 13    |   918 / 15       |   5  |

* - see Note 4 below

Test modes:
  - **min** (minimal services set)
    * priorities are OFF
    * allowed: binary semaphores, flags, messages
  - **normal** (most usual services set)
    * priorities are ON
    * task timers are enabled
    * allowed: binary semaphores, flags, messages
    * waiting with exit on timeout services are enabled
  - **full** (full services set, except user timers)
    * priorities are ON
    * task timers are enabled
    * allowed: binary semaphores, counting semaphores, flags, messages, queues
    * waiting with exit on timeout services are enabled
    * critical sections enabled

(All modes support services for switching context, waiting for events, controlling tasks, enabling/disabling interrupts)


**Notes**:
  - ROM results:
    * size of ROM shown in machine words for PIC10, PIC12 and PIC16 and in bytes for other;
    * for MCC18 initialization code is included;
    * for MCC30 initialization code is included;
  - all test were compiled with maximum optimization;
  - in addition OSA requares RAM for task deskriptors;
  - there is a base size of descriptor in table. It can be greater if:
    * task timer used (##[[en:osa:ref:appendix:configuration|OS_ENABLE_TTIMER]]##) - by ##[[en:osa:ref:appendix:configuration|OS_TTIMER_SIZE]]## bytes (default 2);
    * chips with ROM > 64K requires another 2 bytes per task for saving higher addresses;
    * when using ##[[en:osa:ref:appendix:configuration|OS_PRIORITY_EXTENDED]]## mode, each task requires another 2 bytes;
  - memory usage can be reduced by disabling priority and by using one byte timers (see ##[[en:osa:ref:appendix:configuration|OSAcfg.h]]##).