• 11-bit break character detection option
• 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
• Interrupt-driven operation with flags, not specific to ISO-7816 support
• Transmitter data buffer at or below watermark
• Transmission complete
• Receiver data buffer at or above watermark
• Idle receiver input
• Receiver data buffer overrun
Introduction
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
1216 NXP Semiconductors
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