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PicBasic Pro 12 Bit Core Support
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New Limited 12-bit Core Support
PicBasic Pro version 2.40 added limited support for all the 12-bit
core PIC microcontrollers. The reason the support is limited is
that the resources on the 12-bit core devices are limited. Some
of these limits include only a two-level hardware stack and very
small amounts of general purpose RAM memory. The code page size
is also small at 512 bytes. There is also a limitation that calls
and computed jumps can only be made to the first half (256 words)
of any code page. These limitations have made it necessary to eliminate
some compiler commands and modify the operation of some others.
While many useful programs can be written for the 12-bit core
PIC microcontrollers using the PicBasic Pro Compiler, some applications
will not be suited for these devices. Choosing a 14-bit or 16-bit
core device with more resources will, in many cases, be the best
solution.
Commands that are not supported for the 12-bit core PIC microcontrollers:
| Command |
Reason |
| ADCIN |
No internal ADCs |
| DATA |
No on-chip EEPROM |
| DTMFOUT |
Not enough RAM or stack |
| EEPROM |
No on-chip EEPROM |
| FREQOUT |
Not enough RAM or stack |
| HPWM |
No hardware PWM |
| HSERIN |
No hardware serial port |
| HSEROUT |
No hardware serial port |
| ON INTERRUPT |
No Interrupts |
| READ |
No on-chip EEPROM |
| READCODE |
No flash devices |
| RESUME |
No Interrupts |
| SERIN2 |
Not enough RAM or stack |
| SEROUT2 |
Not enough RAM or stack |
| USBIN |
No USB devices |
| USBINIT |
No USB devices |
| USBOUT |
No USB devices |
| WRITE |
No on-chip EEPROM |
| WRITECODE |
No flash devices |
| XIN |
Not enough RAM or stack |
| XOUT |
Not enough RAM or stack |
Trying to use these commands with 12-bit core devices will result
in numerous errors. If you must use one of these commands, choose
a 14-bit or 16-bit core device with more resources.
Commands that have had their operation modified are:
- DEBUG, DEBUGIN - The SERIN2 and SEROUT2 modifiers
are not supported for these commands because of memory
and stack size limits.
- LCDOUT - The SEROUT2 modifiers are not supported
for this command because of memory and stack size limits.
- OWIN, OWOUT - The REP, SKIP and STR modifiers are
not supported for these commands because of memory and
stack size limits.
- SEROUT - The open drain modes are not available
due to TRIS register constraints.
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Page Updated:
18/05/10
Copyright © 2002-2010
Warburton Technology
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