xr16m564 Exar Corporation, xr16m564 Datasheet - Page 38

• Manufacturer Part Number: xr16m564
• Description: 1.62v To 3.63v Quad Uart With 32-byte Fifo
• Manufacturer: Exar Corporation

XR16M564/564D
1.62V TO 3.63V QUAD UART WITH 32-BYTE FIFO
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.
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EFR[7]: Auto CTS Flow Control Enable
Automatic CTS Flow Control.
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These registers are used as the programmable software flow control characters xoff1, xoff2, xon1, and xon2.
For more details, see
4.13
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 LOW.
Software Flow Control Registers (XOFF1, XOFF2, XON1, XON2) - Read/Write
Table
8.
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