XR16L580 Exar Corporation, XR16L580 Datasheet - Page 33

• Manufacturer Part Number: XR16L580
• Description: Smallest 2.25 to 5.5V Uart With 16-Byte Fifo And Power-save
• Manufacturer: Exar Corporation

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REV. 1.2.0
EFR[6]: Auto RTS Flow Control Enable
RTS# output may be used for hardware flow control by setting EFR bit-6 to logic 1. When Auto RTS is
selected, an interrupt will be generated when the receive FIFO is filled to the programmed trigger level and
RTS de-asserts to a logic 1 at one trigger level above the programmed trigger level. RTS# will return to a logic
0 when FIFO data falls below one trigger level below the programmed trigger level. The RTS# output must be
asserted (logic 0) before the auto RTS can take effect. RTS# pin will function as a general purpose output
when hardware flow control is disabled.
EFR[7]: Auto CTS Flow Control Enable
Automatic CTS Flow Control.
These registers are used as the programmable software flow control characters xoff1, xoff2, xon1, and xon2.
For more details, refer to “Section 2.15, Auto Xon/Xoff (Software) Flow Control” on page 16.
4.16
Logic 0 = Automatic RTS flow control is disabled (default).
Logic 1 = Enable Automatic RTS flow control.
Logic 0 = Automatic CTS flow control is disabled (default).
Logic 1 = Enable Automatic CTS flow control. Data transmission stops when CTS# input de-asserts to logic 1.
Data transmission resumes when CTS# returns to a logic 0.
Software Flow Control Registers (XOFF1, XOFF2, XON1, XON2) - Write Only
SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
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XR16L580