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Features

23.1.1.6 Instructions Features

The N2HET has the following instructions features:

• N2HET uses a RISC-based specialized timer micromachine to carry out a set of 30 instructions

• Instructions are implemented in a Very Long Instruction Word (VLIW) format (96 bits wide)

• The N2HET program execution is self-driven by external or internal events, branching to special

routines based on input edges or output compares

• Instructions point to the next instruction executed, eliminating the need for a program counter

• Several instructions can change the program flow based on internal or external conditions

23.1.1.7 Program Usage

The N2HET instructions/program can be assembled with the N2HET assembler. The assembler generates

a C-structure which can be included into the main application program. The application has to copy the

content of the structure into the N2HET RAM, set up necessary registers and start the N2HET program

execution. In addition to the C-structure, the assembler generates also a header file which makes it easy

for the main application to access the different instructions and change for example the duty cycle of a

PWM or read out the captured value of a specific signal edge.

23.1.2 Block Diagram

The N2HET module (see Figure 23-1) comprises four separate components:

• Host interface

• N2HET RAM

• Specialized timer micromachine

• I/O control (the N2HET is attached to an I/O port of up to 32 pins)

933

SPNU562–May 2014 High-End Timer (N2HET) Module

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