AT83EC5123 ATMEL Corporation, AT83EC5123 Datasheet - Page 50

• Manufacturer Part Number: AT83EC5123
• Description: (AT8xx512x) Smart Card Reader ICs
• Manufacturer: ATMEL Corporation

50
AT8xC5122/23
Table 44. Smart Card Selection Register - SCSR (S:ABh)
Reset Value = X000 1000b
Table 45. Smart Card Transmit Buffer Register - SCTBUF (S:AA, write-only, SCRS=0)
Reset Value = 0000 0000b
Number
Number
Bit
Bit
3-2
7
7
7
6
5
4
1
0
-
-
-
Mnemonic Description
Mnemonic
ALTKPS1:0
CREPSEL
BGTEN
SCCLK1
BGTEN
SCRS
Bit
6
Bit
6
-
-
-
-
Can store a new byte to be transmitted on the I/O pin when SCTBE is set.
Bit ordering on the I/O pin depends on the Convention.
Description
Reserved
The value read from this bit is indeterminate. Do not change this bit.
Block Guard Time Enable
Set this bit to select the minimum interval between the leading edge of the start
bits of the last received character and the first character sent in the opposite
direction. The transfer of GT[8-0] value to the BGT counter is done on the rising
edge of the BGTEN.
Clear this bit to suppress the minimum time between reception and
transmission.
Reserved
The value read from this bit is indeterminate. Do not change this bit.
Character repetition selection
Clear this bit to select 5 times repetition before parity error indication
Set this bit to select 4 times repetition before parity error indication
Alternate Card Clock prescaler factor
01
10
11
Alternate card clock selection
Set to select the prescaled clock (CCLK1)
Clear to select the standard port configuration
Smart Card Register Selection
The SCRS bit selects which set of the SCIB registers is accessed.
00
5
5
-
-
ALTKPS = 2: prescaler factor equals 4 (reset value)
ALTKPS = 3: prescaler factor equals 8
ALTKPS = 0: prescaler factor equals 1
ALTKPS = 1: prescaler factor equals 2
CREPSEL
4
4
-
ALTKPS1
3
3
-
ALTKPS0
2
2
-
SCCLK1
1
1
-
4202B–SCR–07/03
SCRS
0
0
-