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13.2.2 Serial interface channels 1 and 2
The GIU also provides pin mapping for the serial interface (equivalent to 16550 UART) channels 1 and 2.
The serial interface channel 1 (SIU1) is enabled by writing to the GPIO Mode registers. It utilizes the following
GPIO pins:
GPIO pin
GPIO26
GPIO25
GPIO31
GPIO30
GPIO28
GPIO27
GPIO29
The GIU drives inputs to the serial interface channel 1 based on the settings in the GPIO Mode registers and bit
15, LOOPBK1, of the GPSICTL register (address: 0x0B00 031A) (for additional information, see 13.3.14 GPSICTL
(0x0B00 031A)).
When GPIO pins have been assigned to provide the serial interface channel 1 inputs, RxD1, DTR1#, RTS1#, and
DCD1#, the GIU simply passes the signals driven on the GPIO pins to the corresponding serial interface channel 1
inputs. Otherwise, the GIU drives these signals based on the value programmed in the GPSICTL register as follows:
Table 13-5. Serial Interface Channel 1 (SIU1) Loopback Control
LOOPBK1 bit value
0
1
CHAPTER 13 GENERAL PURPOSE I/O UNIT (GIU)
Table 13-4. Serial Interface Channel 1 (SIU1) Signals
SIU1 signal
TxD1
RxD1
DSR1#
DTR1#
CTS1#
RTS1#
DCD1#
DSR1#: REGDSR1 (bit 9) value
CTS1#: REGCTS1 (bit 10) value
DCD1#: REGDCD1 (bit 8) value
RxD1: REGRXD1 (bit 11) value
DSR1#: DTR1# output
CTS1#: RTS1# output
DCD1#: REGDCD1 (bit 8) value
RxD1: REGRXD1 (bit 11) value
User's Manual U14272EJ3V0UM
Output
Input
Input
Output
Input
Output
Input
Source for driving SIU1 input
Type
239
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