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New Limited 12-bit Core Support PicBasic Pro version 2.40 adds limited support for all the 12-bit core PICmicro microcontrollers. The reason the support is limited is that the resources on the 12-bit core devices are very 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 PICmicro MCUs using the PicBasic Pro Compiler, some applications will not be suited for these devices. Choosing a 14- 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 PICmicro MCUs: 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- 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.

Page up-dated at December 20, 2003

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