ST STM32L4x6 User Manual

DocID024597 Rev 3 1363/1685
RM0351 Single Wire Protocol Master Interface (SWPMI)
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40 Single Wire Protocol Master Interface (SWPMI)
40.1 Introduction
The Single Wire Protocol Master Interface (SWPMI) is the master interface corresponding to
the Contactless front-end (CLF) defined in the ETSI TS 102 613 technical specification.
The principle of the Single wire protocol (SWP) is based on the transmission of digital
information in full duplex mode:
• S1 signal (from Master to Slave) is transmitted by a digital modulation (L or H) in the
voltage domain (refer to Figure 452: S1 signal coding),
• S2 signal (from Slave to Master) is transmitted by a digital modulation (L or H) in the
current domain (refer to Figure 453: S2 signal coding).
Figure 452. S1 signal coding
Figure 453. S2 signal coding
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ST STM32L4x6 Specifications

General

Brand	ST
Model	STM32L4x6
Category	Microcontrollers
Language	English