SAM9263 Atmel Corporation, SAM9263 Datasheet - Page 50
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SAM9263
Manufacturer Part Number
SAM9263
Description
Manufacturer
Atmel Corporation
Datasheets
1.M40800.pdf
(284 pages)
2.M40800.pdf
(153 pages)
3.SAM9260.pdf
(290 pages)
4.SAM9261.pdf
(248 pages)
5.SAM9263.pdf
(1109 pages)
6.SAM9263.pdf
(51 pages)
Specifications of SAM9263
Flash (kbytes)
0 Kbytes
Pin Count
324
Max. Operating Frequency
240 MHz
Cpu
ARM926
Hardware Qtouch Acquisition
No
Max I/o Pins
160
Ext Interrupts
160
Usb Transceiver
3
Usb Speed
Full Speed
Usb Interface
Host, Device
Spi
2
Twi (i2c)
1
Uart
4
Can
1
Ssc
2
Ethernet
1
Sd / Emmc
2
Graphic Lcd
Yes
Video Decoder
No
Camera Interface
Yes
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
96
Self Program Memory
NO
External Bus Interface
2
Dram Memory
sdram
Nand Interface
Yes
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8/3.3
Fpu
No
Mpu / Mmu
No / Yes
Timers
3
Output Compare Channels
3
Input Capture Channels
3
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
No
- M40800 PDF datasheet
- M40800 PDF datasheet #2
- SAM9260 PDF datasheet #3
- SAM9261 PDF datasheet #4
- SAM9263 PDF datasheet #5
- SAM9263 PDF datasheet #6
- Current page: 50 of 284
- Download datasheet (2Mb)
Programmer’s Model
2.3
2.3.1
2-4
31
Memory formats
Little-endian
Byte at address A+3
Halfword at address A+2
The ARM7TDMI processor views memory as a linear collection of bytes numbered in
ascending order from zero. For example:
•
•
The ARM7TDMI processor is bi-endian and can treat words in memory as being stored
in either:
•
•
Little-endian is traditionally the default format for ARM processors.
The endian format of a CPU dictates where the most significant byte or digits must be
placed in a word. Because numbers are calculated by the CPU starting with the least
significant digits, little-endian numbers are already set up for the processing order.
Endian configuration has no relevance unless data is stored as words and then accessed
in smaller sized quantities (halfwords or bytes).
In little-endian format, the lowest addressed byte in a word is considered the
least-significant byte of the word and the highest addressed byte is the most significant.
So the byte at address 0 of the memory system connects to data lines 7 through 0.
For a word-aligned address A, Figure 2-1 shows how the word at address A, the
halfword at addresses A and A+2, and the bytes at addresses A, A+1, A+2, and A+3
map on to each other when the core is configured as little-endian.
24 23
bytes zero to three hold the first stored word
bytes four to seven hold the second stored word.
Little-endian on page 2-4.
Big-Endian on page 2-5
Note
Byte at address A+2
Figure 2-1 LIttle-endian addresses of bytes and halfwords within words
Copyright © 1994-2001. All rights reserved.
Word at address A
16 15
Byte at address A+1
Halfword at address A
8 7
Byte at address A
ARM DDI 0029G
0
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