Rainbow Electronics AT89C5122 - Manual (Page 86)

86
AT8xC5122/23
4202E–SCR–06/06
Reset Value = 0000 1100b
Reset Value = XXXX XXX0b
Reset Value = 0000 0000b
Table 53. Smart Card Transmit Guard Time Register 0 - SCGT0 (S:B4h, SCRS=1)
7 6 5 4 3 2 1 0
GT7 GT6 GT5 GT4 GT3 GT2 GT1 GT0
Bit Number Bit Mnemonic Description
7 - 0 GT[7:0]
Transmit Guard Time LSB
The minimum time between two consecutive start bits in transmit mode is GT[8:0] * ETU. This is equal to ISO IEC
Guard Time +10 (see Guard Time Counter description.
According to ISO IEC 7816,the time between 2 consecutive leading edge start bits can be set between 11 and
266 (11 to 254+12 ETUs).
Table 54. Smart Card Transmit Guard Time Register 1 - SCGT1 (S:B5h, SCRS=1)
7 6 5 4 3 2 1 0
- - - - - - - GT8
Bit Number Bit Mnemonic Description
7 - 1 -
Reserved
The value read from these bits is indeterminate. Do not change these bits.
0 GT8
Transmit Guard Time MSB
Used together with the Transmit Guard Time LSB in SCGT0 register (Table 53).
Table 55. Smart Card Character/Block Waiting Time Register 3
SCWT3 (S:C1h, SCRS=0)
7 6 5 4 3 2 1 0
WT31 WT30 WT29 WT28 WT27 WT26 WT25 WT24
Bit Number Bit Mnemonic Description
7 - 0 WT[31:24]
Waiting Time Byte3
Used together with WT[23:0] in registers SCWT2,SCWT1, SCWT0 (see Table 56).