XR16M2650 Datasheet, PDF (34/47 Pages) Exar Corporation – HIGH PERFORMANCE LOW VOLTAGE DUART WITH 32-BYTE FIFO

XR16M2650
HIGH PERFORMANCE LOW VOLTAGE DUART WITH 32-BYTE FIFO
REV. 1.0.2
EFR[6]: Auto RTS Flow Control Enable
RTS# output may be used for hardware flow control by setting EFR bit-6 to HIGH. When Auto RTS is selected,
an interrupt will be generated when the receive FIFO is filled to the selected trigger level and RTS de-asserts
HIGH at the next upper trigger level. RTS# will return LOW when FIFO data falls below the next lower trigger
level. The RTS# output must be asserted (LOW) before the auto RTS can take effect. RTS# pin will function as
a general purpose output when hardware flow control is disabled.
• Logic 0 = Automatic RTS flow control is disabled (default).
• Logic 1 = Enable Automatic RTS flow control.
EFR[7]: Auto CTS Flow Control Enable
Automatic CTS 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 HIGH.
Data transmission resumes when CTS# returns LOW.
4.14.1 Software Flow Control Registers (XOFF1, XOFF2, XON1, XON2) - Read/Write
These registers are used as the programmable software flow control characters xoff1, xoff2, xon1, and xon2.
For more details, see Table 7.
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