Method for realizing interface of contact smart ic card by simulating on chip of application processor
An application processor, card interface technology, applied in the direction of electrical digital data processing, instruments, etc., can solve the problems of increasing chip cost, lack of interface, long design verification cycle, etc., to achieve the effect of saving chip cost and realizing flexible solutions
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[0017] Figure 1 to Figure 3 It shows a schematic diagram of the implementation process of the method for simulating the contact smart IC card interface on the application processor chip of the present invention. The method includes resetting the hardware interface to an analog interface and driving the IC card.
[0018] First you need to reset the hardware interface to an analog interface. Since the contact smart card follows the ISO / IEC7816 specification standard, the interface signal is defined as:
[0019] GND ground, reference voltage
[0020] VCC power input
[0021] I / O serial data input / output
[0022] CLK clock signal input
[0023] RST reset signal input
[0024] VPP programming voltage, selected by the card
[0025] The most important ones are the three signals of I / O, CLK, and RST. The character frame format defined on the I / O signal is as follows: image 3 shown, where:
[0026] ●The start bit is required to be low level,
[0027] ●The parity bit requires...
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