Precautions - Epson S1C17001 Technical Manual

18.10 Precautions

• Change the UART settings only while transfers are blocked (RXEN = 0).
∗ RXEN: UART Enable Bit in the UART Control (UART_CTL) Register (D0/0x4104)
• Do not set RXEN to 0 while the UART is transmitting or receiving data.
• The UART transfer rate is capped at 460,800 bps (115,200 bps in IrDA mode). Do not set faster transfer rates.
• Preventing transfer by setting RXEN to 0 clears (initializes) transfer data buffers. Before writing 0 to RXEN,
confirm the absence of data in the buffers awaiting transmission or reading.
• The IrDA receive detection clock must be selected as a clock faster than the 8-bit timer or transfer clock sclk in-
put via the SCLK pin.
• The IrDA interface demodulation circuit treats Low pulses with a width of at least 2 IrDA receive detection clock
cycles as valid. Select the appropriate prescaler output clock to enable detection of input pulses with a minimum
width of 1.41 μs as a 2 IrDA receive detection clock.
S1C17001 TECHNICAL MANUAL
EPSON
18 UART
231