topic K22(MK22FN512CAP12R) using ISO 7816 in Kinetis Microcontrollers

K22(MK22FN512CAP12R) using ISO 7816

yaochiayang — Tue, 17 Nov 2015 07:28:49 GMT

Hi all,

for ISO7816, three pins are used for communication.

CLK, I/O and RST.

I/O

I will connect I/O with UART0_TX, for I could see in some document UART_TX could be configured to I/O pin for 7816 standard.

also, UART0 are the only one which supports ISO7816 in K22 120MHz.

RST

i will connect RST to UART0_RTS_b.

CLK

i see this information in the forum as well. CLK is suggested to tie with FTM.

i am gonna connect this with FTM0_CH5. is this feasible?

as far as i learn from the reference manual, it seems configurable though.

is the way connection gonna work for SW?

thanks,

Lawrence

Re: K22(MK22FN512CAP12R) using ISO 7816

Kan_Li — Mon, 23 Nov 2015 07:10:09 GMT

Hi Lawrence,

I am sorry, but the ISO7816 RST signal is a reset signal, not the function of UART RTS(Request to send), so if you connected RST to UART0_RTS_b, you should configure this pin as GPIO function, not the UART0_RTS_b function.

Hope that helps,

Have a great day,
Kan

Freescale Technical Support
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