The first part of this ApNote will give a basic understanding of the PCP architecture.This contains the two different ways to use the Code Memory, the 8 General Purpose Registers and the three different Context settings. Later in the second part, this concept will be described in more detail on different examples.
1 Introduction 3
2 The PCP Structure 4
2.1 Code Memory Organization 4
2.2 PCP Parameter RAM (PRAM) Organization 5
2.3 Context Registers....7
2.4 Example Configurations 9
2.4.1 Normal, Multi Channel 9
2.4.2 Restore PC, Multi-Channel 12
2.4.3 Small Context .15
3 A PCP program: The Pulse With Modulation (PWM) in simple steps.17
3.1 The PCP-Program Structure 17
3.2 Simple PWM.19
3.3 Complex PWM and interrupt to the CPU....21
4 Hints on how to program the PCP..23
4.1 Initial PC.23
4.1.1 Channel Entry Table.23
4.1.2 PC Resume ..23
4.2 Channel Management for Minimum Context ...24
4.2.1 Global Registers ...25
4.2.2 Interrupt Windows.25
4.3 Dispatch of Low Priority Tasks...25
4.4 Code Reuse Across Channels (Call / Return) .26
4.5 Case-like Code Switches (Computed Go-To) .26
5 Appendix – PWM program listing ...27