R40008 Atmel Corporation, R40008 Datasheet - Page 25
R40008
Manufacturer Part Number
R40008
Description
Manufacturer
Atmel Corporation
Datasheets
1.M40800.pdf
(284 pages)
2.M40800.pdf
(153 pages)
3.R40008.pdf
(19 pages)
4.R40008.pdf
(20 pages)
Specifications of R40008
Flash (kbytes)
0 Kbytes
Pin Count
100
Max. Operating Frequency
75 MHz
Cpu
ARM7TDMI
Hardware Qtouch Acquisition
No
Max I/o Pins
32
Ext Interrupts
32
Usb Speed
No
Usb Interface
No
Uart
2
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
256
Self Program Memory
NO
External Bus Interface
1
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
3.3
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
3
Input Capture Channels
3
32khz Rtc
No
Calibrated Rc Oscillator
No
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1.1.2
ARM DDI 0029G
Memory access
During normal operation, while one instruction is being executed, its successor is being
decoded, and a third instruction is being fetched from memory.
The program counter points to the instruction being fetched rather than to the instruction
being executed. This is important because it means that the Program Counter (PC)
value used in an executing instruction is always two instructions ahead of the address.
The ARM7TDMI core has a Von Neumann architecture, with a single 32-bit data bus
carrying both instructions and data. Only load, store, and swap instructions can access
data from memory.
Data can be:
•
•
•
Words must be aligned to 4-byte boundaries. Halfwords must be aligned to 2-byte
boundaries.
8-bit (bytes)
16-bit (halfwords)
32-bit (words).
Copyright © 1994-2001. All rights reserved.
Execute
Decode
Fetch
Instruction fetched from memory
Decoding of registers used in
instruction
Register(s) read from register bank
Perform shift and ALU operations
Write register(s) back to register bank
Figure 1-1 Instruction pipeline
Introduction
1-3
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