ATR的基本结构与意义（无历史字符部分）

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3B FA 13 00 00 81 31 FE 45 4A 43 4F 50 34 31 56 32 32 31 96

复位应答 ATR

TS( The Initial character ) = 3B

--表示正向约定，高电平为1，低电平为0，传输时先传输LSB，最后传输MSB

T0( The Format character ) = FA

--表示接口字符的个数和历史字节的数量

----低4位有几个bit为1，则表示后续有几个历史字符(Historical bytes)

----高4位 = f( 1 1 1 1 )表示后续字符中存在TA1 TB1 TC1 TD1 --------------------( TA1, TB1, TC1, TA2, TB2 是全局接口字符，TC2是专用接口字符 )

TA1 = 13

--表示有增强的波特率，公式 3571200 / ( Fi / Di )

--------其中Fi由TA1的高4位(F)查表得出，Di由TA1的低4位(D)查表得出

----F = 01 ，查下表，则Fi = 372

+-------------+--------+--------+--------+--------+--------+--------+--------+--------+

| F | 0000 | 0001 | 0010 | 0011 | 0100 | 0101 | 0110 | 0111 |

+-------------+--------+--------+--------+--------+--------+--------+--------+--------+

| Fi | 372 | 372 | 558 | 744 | 1116 | 1488 | 1860 | RFU |

+-------------+--------+--------+--------+--------+--------+--------+--------+--------+

| 最高时钟MHZ | 4 | 5 | 6 | 8 | 12 | 16 | 20 | -- |

+-------------+--------+--------+--------+--------+--------+--------+--------+--------+

| F | 1000 | 1001 | 1010 | 1011 | 1100 | 1101 | 1110 | 1111 |

+-------------+--------+--------+--------+--------+--------+--------+--------+--------+

| Fi | RFU | 512 | 768 | 1024 | 1536 | 2048 | RFU | RFU |

+-------------+--------+--------+--------+--------+--------+--------+--------+--------+

| 最高时钟MHZ | -- | 5 | 7.5 | 10 | 15 | 20 | -- | -- |

+-------------+--------+--------+--------+--------+--------+--------+--------+--------+

----D = 03 ，查下表，则Di = 4

+-------------+--------+--------+--------+--------+--------+--------+--------+--------+

| D | 0000 | 0001 | 0010 | 0011 | 0100 | 0101 | 0110 | 0111 |

+-------------+--------+--------+--------+--------+--------+--------+--------+--------+

| Di | RFU | 1 | 2 | 4 | 8 | 16 | 1860 | RFU |

+-------------+--------+--------+--------+--------+--------+--------+--------+--------+

| D | 1000 | 1001 | 1010 | 1011 | 1100 | 1101 | 1110 | 1111 |

+-------------+--------+--------+--------+--------+--------+--------+--------+--------+

| Di | RFU | 512 | 768 | 1024 | 1536 | 2048 | RFU | RFU |

+-------------+--------+--------+--------+--------+--------+--------+--------+--------+

--------实际波特率为 38400

TB1 = 00

----表示编程电流 I /电压 P，高2位表示电流I，低6位表示电压P

----高2位 = 00 ，则编程电流 I 如下

+-------+--------+--------+--------+--------+

| 高2位 | 00 | 01 | 10 | 11 |

+-------+--------+--------+--------+--------+

| 电流I | 25 | 50 | RFU | RFU |

+-------+--------+--------+--------+--------+

----低6位 = 00 ，则编程 P 电压为0

TC1 = 00

----额外保护时间N = 0 

TD1 = 81

----通讯协议 T = 1

--------------------

没有TA2

没有TB2

没有TC2

TD2 = 31

--------------------

TA3 = FE

TB3 = 45

没有TC3

没有TD3

4A 43 4F 50 34 31 56 32 32 31

----是历史字节

TCK ( XOR T0 - TCK ) = 96 校验成功