Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Fiche De Données
Codes de produits
AT91SAM9N12-EK
Coprocessor Interface
ARM DDI0198D
Copyright © 2001-2003 ARM Limited. All rights reserved.
8-3
This is one technique for generating a clock that reflects the ARM9EJ-S core pipeline
advancing. If CPCLKEN is LOW on the rising edge of CPCLK then the ARM9EJ-S
core pipeline is stalled and the coprocessor pipeline should not advance.
advancing. If CPCLKEN is LOW on the rising edge of CPCLK then the ARM9EJ-S
core pipeline is stalled and the coprocessor pipeline should not advance.
Coprocessor instructions
There are three classes of coprocessor instructions:
LDC or STC
Load coprocessor register from memory or store coprocessor
register to memory.
register to memory.
MCR/MCRR or MRC/MRRC
Register transfer between the coprocessor and the ARM processor
core.
core.
CDP
Coprocessor data operation.
Examples of how a coprocessor must execute these instruction classes are given in:
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