XR16L651CM EXAR [Exar Corporation], XR16L651CM Datasheet - Page 31

• Manufacturer Part Number: XR16L651CM
• Description: 2.25V TO 5.5V UART WITH 32-BYTE FIFO
• Manufacturer: EXAR [Exar Corporation]

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REV. 1.3.0
LCR[7]: Baud Rate Divisors Enable
Baud rate generator divisor (DLL/DLM) enable.
The MCR register is used for controlling the serial/modem interface signals or general purpose inputs/outputs.
MCR[0]: DTR# Pins
The DTR# pin is a modem control output. If the modem interface is not used, this output may be used for
general purpose.
MCR[1]: RTS# Pins
The RTS# pin is a modem control output and may be used for automatic hardware flow control enabled by
EFR bit-6. If the modem interface is not used, this output may be used for general purpose.
MCR[2]: OP1# Output
OP1# is a general purpose output.
MCR[3]: OP2# or IRQn Enable during PC Mode
OP2# is a general purpose output available during the Intel or Motorola bus interface mode of operation. In the
PC bus mode, it enables the IRQn operation. See PC Mode section.
During Intel or Motorola Bus Mode Operation:
During PC Mode Operation:
MCR[4]: Internal Loopback Enable
MCR[5]: Active/Three-state Interrupt Output Enable
4.7
Logic 0 = Data registers are selected (default).
Logic 1 = Divisor latch registers are selected if
Logic 0 = Force DTR# output to a logic 1 (default).
Logic 1 = Force DTR# output to a logic 0.
Logic 0 = Force RTS# output to a logic 1 (default).
Logic 1 = Force RTS# output to a logic 0.
Logic 0 = OP1# output is at logic 1 (default).
Logic 1 = OP1# output is at logic 0
Logic 0 = OP2# output is at logic 1 (default).
Logic 1 = OP2# output is at logic 0.
Logic 0 = Disable IRQn operation (default).
Logic 1 = Enable IRQn operation.
Logic 0 = Disable loopback mode (default).
Logic 1 = Enable local loopback mode, see loopback section and
Logic 0 = Enable active or three-state interrupt output (default).
Logic 1 = Enable open source interrupt output mode. See
Modem Control Register (MCR) or General Purpose Outputs Control - Read/Write
LCR
31
0xBF
.
Table 3
2.25V TO 5.5V UART WITH 32-BYTE FIFO
Figure
for detailed information.
15.
XR16L651