AT91SAM9G46B-CU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT91SAM9G46B-CU

SMART ARM-based Embedded MPU

Atmel Corporation 

The fast interrupt mode has seven private registers r8 to r14 (banked registers) to reduce or remove the

requirement for register saving which minimizes the overhead of context switching.

The Prefetch Abort is one of the aborts that indicates that the current memory access cannot be completed. When

a Prefetch Abort occurs, the ARM9EJ-S marks the prefetched instruction as invalid, but does not take the

exception until the instruction reaches the Execute stage in the pipeline. If the instruction is not executed, for

example because a branch occurs while it is in the pipeline, the abort does not take place.

The breakpoint (BKPT) instruction is a new feature of ARM9EJ-S that is destined to solve the problem of the

Prefetch Abort. A breakpoint instruction operates as though the instruction caused a Prefetch Abort.

A breakpoint instruction does not cause the ARM9EJ-S to take the Prefetch Abort exception until the instruction

reaches the Execute stage of the pipeline. If the instruction is not executed, for example because a branch occurs

while it is in the pipeline, the breakpoint does not take place.

40 SAM9G46 Series [DATASHEET]

Atmel-11028G-ATARM-SAM9G46-Datasheet_08-Dec-15

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