User's Manual

5
1.4 BSC ( I
2
C -compatible) Characteristics
Following are the main features of NFC module I
2
C interface
• Slave mode
• Low-speed mode (100kbps), fast mode (400kbps), and high-speed mode (3.4Mbps)
• 7-bit or 10-bit addressing mode, default boot-up of fixed 7-bit address (0x77), thereafter
configurable to 7-bit or 10-bit addresses
• Dedicated TX and RX FIFOs, 272 bytes each.
BSC Timing waveform
I
2
C _REQ is an output signal from the module to the host that it wishes to communicate.
The timing diagram as below shows I
2
C _REQ as active high.
The I
2
C _REQ signal stays high until after the first byte has been read by the host.
I
2
C _REQ timing waveform