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Section 16 Serial Pin Multiplexed Modes
Three serial communication I/F modules (SCIF, SCI_1 and SCI_3) can be configured for five
types of COM port assignments and internal connections (serial pin multiplexed modes) in this
LSI. Two registers are provided for controlling the serial pin multiplexed modes: serial
multiplexed mode register 0 (SMR0) and serial multiplexed mode register 1 (SMR1).
16.1
Features
Internal connection of serial modules to COM ports can be configured to make a software bridge
for IPMI applications.
• Five serial pin multiplexed modes
Mode 0: Each COM port is used for its respective serial communication module: COM1
for SCIF, COM2 for SCI_1 and COM3 for SCI_3 (default mode)
Mode 1: COM1 snoop mode with use of SCI_1 and internal registers
Mode 2: SCIF-and-SCI_1 bridge mode in which internal registers provide software flow
control.
Mode 3: COM port switched mode in which COM1 is connected to SCI_1 and COM2 is
connected to SCIF. Internal registers provide flow control for SCI_1.
Mode 4: SCIF-and-SCI_3 bridge mode providing the same functionality as mode 3.
Please refer to section 13, Serial Communication Interface (SCI) for details on SCI_1 and SCI_3,
and section 15, Serial Communication Interface with FIFO (SCIF), for details on SCIF.
Section 16 Serial Pin Multiplexed Modes
Rev. 1.00 Mar. 12, 2008 Page 541 of 1178
REJ09B0403-0100
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