Information

• 11-bit break character detection option
• Independent FIFO structure for transmit and receive
• Two receiver wakeup methods:
• Idle line wakeup
• Address mark wakeup
• Address match feature in the receiver to reduce address mark wakeup ISR overhead
• Ability to select MSB or LSB to be first bit on wire
• Hardware flow control support for request to send (RTS) and clear to send (CTS)
signals
• Support for ISO 7816 protocol to interface with SIM cards and smart cards
• Support for T=0 and T=1 protocols
• Automatic retransmission of NACK'd packets with programmable retry
threshold
• Support for 11 and 12 ETU transfers
• Detection of initial packet and automated transfer parameter programming
• Interrupt-driven operation with seven ISO-7816 specific interrupts:
• Wait time violated
• Character wait time violated
• Block wait time violated
• Initial frame detected
• Transmit error threshold exceeded
• Receive error threshold exceeded
• Guard time violated
• Support for CEA709.1-B protocol used in building automation and home networking
systems
• Automatic clock resynchronization
• Support for collision detection
• Interrupt-driven operation with 12 flags, not specific to ISO-7816 support
Introduction
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
1042 Freescale Semiconductor, Inc.