What is a native binary executable?
The PIC microcontroller executes instructions which are stored in
binary. Native instructions are instructions that the PIC
microcontroller can decode and execute directly in its internal
hardware. Such native instructions are executed in 1 or 2 machine
cycles. Some compilers produce instructions which cannot be executed
directly by the processor but instead must be interpreted by another
program which runs on the processor. Sometimes such a program is refered
to as a tokenised BASIC program, sometimes as byte code, sometimes as
pcode. Such interpreted code can require hundreds of machine cycles to
execute each instruction.
So why is it 14 bit when the PIC is an 8 bit processor?
Each machine code instruction on the PIC is coded into a binary
patern that occupies an instruction word. Arizona MicroChip (the people
that make the PIC microcontroller) produce several versions of
microcontroller. These versions fall into 3 groups 12 bit cores, 14 bit
cores and 16 bit cores. With the exception of the processors memory and
peripheral layout, each processor within a group is binary compatible
(with a few excptions). A program compiled for a 16F84 will run on a
16F628 and on a 16F877. The only special consideration are memory layout
and periperal initialisation and use.