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AT90SCR100 데이터시트(PDF) 198 Page - ATMEL Corporation

부품명 AT90SCR100
상세설명  8-bit Microcontroller for Smart Card Readers
PDF  433 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90SCR100 데이터시트(HTML) 198 Page - ATMEL Corporation

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TPR0327AY–SMS–30Jan09
AT90SCR100
15.7.8
SCETU - Smart Card ETU Register
• Bit 15 – COMP: Compensation
Clear this bit when no time compensation is needed (i.e. when the ETU to Card CLK period ratio
is close to an integer with an error less than 1/4 of Card CLK period).
Set this bit otherwise and reduce the ETU period by 1 Card CLK cycle for even bits.
• Bit 14..11 – Reserved Bits
These bits are reserved for future use.
• Bit 10..0 – ETU: ETU Value
The Elementary Time Unit is (ETU[10:0] - 0.5*COMP)/f, where f is the Card CLK frequency.
According to ISO 7816, ETU[10:0] can be set between 11 and 2048.
The default reset value of ETU[10:0] is 372 (F=372, D=1).
15.7.9
SCGT - Smart Card Guard Time Register
• Bit 15..9 – Reserved Bits
These bits are reserved for future use.
Bit
15
141312
11
10
9
8
$0000F8
COMP
----
ETU [10..8]
SCETUH
$0000F7
ETU [7..0]
SCETUL
Bit
7
6543
2
1
0
Read/write
R/W
R
R
R
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial value
0
0
0
0
0
0
0
1
0x01
0
1110
1
0
0
0x74
The ETU counter is reloaded at each register’s write operation.
Do not change this register during character reception or transmission or while
Guard Time or Waiting Time Counters are running.
Note
Caution
!
Bit
15
141312
11
10
9
8
$0000F6
-----
-
-
GT8
SCGTH
$0000F5
GT [7..0]
SCGTL
Bit
7
6543
2
1
0
Read/write
RRRR
R
R
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial value
0
0
0
0
0
0
0
0
0x00
0
0001
1
0
0
0x0C



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