Automatic Interrupt Context Saving 16-level Stack with Overflow and Underflow File Select Registers Instruction Set Automatic Interrupt Context Saving During interrupts, certain registers are automatically saved in shadow registers and restored when returning from the interrupt. This saves stack space and user code. 16-level Stack with Overflow and Underflow These devices have an external stack memory 15 bits wide and 16 words deep. A Stack Overflow or Underflow will set the appropriate bit (STKOVF or STKUNF) in the PCON register, and if enabled will cause a software Reset. File Select Registers There are two 16-bit File Select Registers (FSR). FSRs can access all file registers and program memory, which allows one Data Pointer for all memory. When an FSR points to program memory, there is one additional instruction cycle in instructions using INDF to allow the data to be fetched. General purpose memory can now also be addressed linearly, providing the ability to access contiguous data larger than 80 bytes. There are also new instructions to support the FSRs. See Section 3.5 "Indirect Addressing" for more details. Instruction Set There are 49 instructions for the enhanced mid-range CPU to support the features of the CPU. See Section 29.0 "Instruction Set Summary" for more details.

Special Microcontroller Features:

1.8V-5.5V Operation – PIC16F1825Read more