at91sam9260-cj ATMEL Corporation, at91sam9260-cj Datasheet - Page 42

• Manufacturer Part Number: at91sam9260-cj
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

11.2
Figure 11-1. ARM926EJ-S Internal Functional Block Diagram
11.3
11.3.1
11.3.2
42
Block Diagram
ARM9EJ-S Processor
AT91SAM9260
ARM9EJ-S Operating States
Switching State
Interface
ICE
EmbeddedICE
WDATA
-RT
Interface
ARM9EJ-S
ETM
The ARM9EJ-S processor can operate in three different states, each with a specific instruction
set:
In Jazelle state, all instruction Fetches are in words.
The operating state of the ARM9EJ-S core can be switched between:
• ARM state: 32-bit, word-aligned ARM instructions.
• THUMB state: 16-bit, halfword-aligned Thumb instructions.
• Jazelle state: variable length, byte-aligned Jazelle instructions.
• ARM state and THUMB state using the BX and BLX instructions, and loads to the PC
Processor
RDATA
INSTR
Coprocessor
DA
Interface
IA
Droute
Iroute
ARM926EJ-S
DCACHE
DEXT
MMU
ICACHE
IEXT
Interface
Interface
TCM
Instruction
Bus
Unit
Interface
Interface
AHB
Data
AHB
6221G–ATARM–31-Jan-08
AHB
AHB