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AT90SCR100 Datasheet(PDF) 340 Page - ATMEL Corporation

Part # AT90SCR100
Description  8-bit Microcontroller for Smart Card Readers
PDF  433 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90SCR100 Datasheet(HTML) 340 Page - ATMEL Corporation

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340
TPR0327AY–SMS–30Jan09
AT90SCR100
25.2.1
Memory Organization
There are 2 address areas: Key and Data. Internal registers can be observed or modified via the
AESADDR and AESDR registers.
Below is a way to organize the memory according to an example:
Figure 25-2.
Example of memory organization
Assembly code is available in section “Example. Code Sample” on page 343.
All bytes must be reverted in the AES Data and Key memory. This means that the
data must be oriented LSB first
As memory is reversed, the AES 128Key LSB will start at address #16 and MSB of
AES128 key will be at address #31
The result is also inverted in Data internal memory (LSB first).
Caution
!
Caution
!
Caution
!
00010203050607080A0B0C0D0F101112
AES128 Key:
506812A45F08C889B97F5980038B8359
Data To cipher:
Ciphered Message: D8F532538289EF7D06B506A4FD5BE9C9
AES_Key
12
11
10
0F
0D
0C
0B
0A
08
07
06
05
03
02
01
00
#0
#15
#16
#31
AES_Data
59
83
8B
03
80
59
7F
B9
89
C8
08
5F
A4
12
68
50
#00
#15
AES_Result
This is what can be read in the
Data register after AES Run of
AES128 encryption
C9
E9
5B
FD
A4
06
B5
06
7D
EF
89
82
53
32
F5
D8
#00
#15



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