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Serial Interface
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13.4 Universal Asynchronous Receiver-Transceiver Serial Interface
13.4.1 Features
Serial interface 3 is a UART serial interface. Its features are described below.
• Parity None, 0 fixed, 1 fixed, even, odd
• Character length 7 bits, 8 bits
• Transmission and reception bit sequence
LSB or MSB selectable
• Clock source IOCLK
Timer 2 or timer 8 underflow
External clock
• Dedicated counter built in
Has an internal 7-bit counter that permits fast bit rates even with a clock source that
operates at a comparatively low frequency.
• Maximum bit rate
230.4 kbit/s (when IOCLK = 15 MHz)
• Error detection during reception
Parity errors, overrun errors, flaming error
• Buffers Independent buffers for transmission and reception:
Reception and transmission buffers are both double buffers
• Interrupts Transmission interrupts:
"Transmission end" or "transmission buffer empty" selectable
Reception interrupts:
"Reception end" or "reception end with error" selectable
• Transmission interrupt function
Transmissions can be interrupted and resumed with the proper external pin and register
settings.