有没有人用过freescale的K60中的UART的7816协议

guojunjunjun200

 请问有没有人用过freescale的K60中的UART的7816协议啊！想知道波特率如何设置。哪位高手能指导 一下啊！

阅读全文

安

请参考下面内容
1、ISO CLK的计算
One character is composed of 10 bits, and each bit is transmitted as I/O in one Elementary Time Unit (ETU). One ETU is
determined by the frequency of CLK (f), clock rate conversion integer (Fi), and baud rate adjustment integer (Di).
1 ETU = Fi / Di * (1/f)
2、K系列 ETU的计算
The ISO-7816 specification defines several wait time and guard time parameters. The
UART allows for flexible configuration and violation detection of these settings. On reset
the wait time (IS7816[WT]) defaults to 9600 ETUs and guard time (GT) to 12 ETUs.
These values are controlled by parameters in the WP7816, WN7816 and WF7816
registers. Additionally the value of C7816[TTYPE] also factors into the calculation. The
formulas used to calculate the number ETU for each wait time and guard time value are
shown in the following table.

guojunjunjun200

再问一下，IC卡的I/O口边到TXD，那如何来控制TXD的电平呢？

安

这个由模块自动控制。如果想了解更详细，去看一下ISO7816的协议就明白了。

Mars-2058306

回复第 2 楼 于2012-11-12 16:28:41发表:
请参考下面内容
1、ISO CLK的计算
One character is composed of 10 bits, and each bit is transmitted as I/O in one Elementary Time Unit (ETU). One ETU is
determined by the frequency of CLK (f), clock rate conversion integer (Fi), and baud rate adjustment integer (Di).
1 ETU = Fi / Di * (1/f)
2、K系列 ETU的计算
The ISO-7816 specification defines several wait time and guard time parameters. The
UART allows for flexible configuration and violation detection of these settings. On reset
the wait time (IS7816[WT]) defaults to 9600 ETUs and guard time (GT) to 12 ETUs.
These values are controlled by parameters in the WP7816, WN7816 and WF7816
registers. Additionally the value of C7816[TTYPE] also factors into the calculation. The
formulas used to calculate the number ETU for each wait time and guard time value are
shown in the following table. 

 我也在用这个 k 系列的 uart 7816协议， 我外接的是 TDA8034  ，我有个问题能不能问一下， 我设置的 CLK提供给卡的 时钟频率是 固定的 5MHZ， 那么在没做pps之前 1个etu = 372/5000000 = 75us,  波特率是  5000000/372 = 13440 bit/s   ，请问 那么卡片发送 atr 给终端 是 用13440 波特率， 为什么不是 默认的 9600 ？