XR16M781 Exar Corporation, XR16M781 Datasheet - Page 41
XR16M781
Manufacturer Part Number
XR16M781
Description
1.62V TO 3.63V UART
Manufacturer
Exar Corporation
Datasheet
1.XR16M781.pdf
(52 pages)
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REV. 1.0.1
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 HIGH at the next upper trigger level/hysteresis level. RTS# will return LOW when FIFO data
falls below the next lower trigger level/hysteresis 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.
•
•
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, see
enabled.
4.18
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) - Read/Write
See ”Section 2.15.1, Auto Address Detection” on page 19.
Table
5. The xoff2 is also used as auto address detect register when the auto 9-bit mode
1.62V TO 3.63V UART WITH 64-BYTE FIFO AND VLIO INTERFACE
41
XR16M781