xr16l651im Exar Corporation, xr16l651im Datasheet - Page 37

• Manufacturer Part Number: xr16l651im
• Description: 2.25v To 5.5v Uart With 32-byte Fifo
• Manufacturer: Exar Corporation

áç
áç
áç
áç
REV. 1.3.0
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 (if IER bit-6 = 1) when the receive FIFO is filled to the programmed
trigger level and RTS de-asserts to a logic 1 at the next upper trigger level. RTS# will return to a logic 0 when
FIFO data falls below the next lower 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, see
4.17
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# input returns to a logic 0.
Software Flow Control Registers (XOFF1, XOFF2, XON1, XON2) - Read/Write
Table
5.
37
2.25V TO 5.5V UART WITH 32-BYTE FIFO
XR16L651