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GPIO MUX
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GPIO MUX
The BBus utility contains the control pins for each GPIO MUX bit. Each pin can be selected
individually; that is, you can select any option (00, 01, 02, 03) for any pin, by setting the
appropriate bit in the appropriate register.
Some signals are muxed to two different GPIO pins, to maximize the number of possible
applications. These duplicate signals are marked as such in the Descriptions column in the
table. Selecting the primary GPIO pin and the duplicate GPIO pin for the same function is not
recommended. If both the primary GPIO pin and duplicate GPIO pin are programmed for the
same function, however, the primary GPIO pin has precedence and will be used.
The 00 option for the serial ports (B, A, C, and D) are configured for UART and SPI mode,
respectively; that is, the UART option is shown first, followed by the SPI option if there is one.
If only one value appears, it is the UART mode value. SPI options all begin with SPI.
Pin # Signal name
U/D
OD
(mA)
I/O Descriptions (4 options: 00, 01, 02, 03)
AF19 gpio[0]
1
U 2 I/O 00 Ser port B TxData / SPI port B dout
01 DMA ch 1 done (duplicate)
02 Timer 1 (duplicate)
03 GPIO 0
AE18 gpio[1] U 2 I/O 00 Ser port B RxData / SPI port B din
01 DMA ch 1 req (duplicate)
02 Ext IRQ 0
03 GPIO 1
AF18 gpio[2]
1
U 2 I/O 00 Ser port B RTS
01 Timer 0
02 DMA ch 2 read enable
03 GPIO 2
AD17 gpio[3] U 2 I/O 00 Ser port B CTS
01 1284 nAck (peripheral-driven)
02 DMA ch 1 req
03 GPIO 3
AE17 gpio[4]
1
U 2 I/O 00 Ser port B DTR
01 1284 busy (peripheral-driven)
02 DMA ch 1 done
03 GPIO 4
AF17 gpio[5] U 2 I/O 00 Ser port B DSR
01 1284 PError (peripheral-driven)
02 DMA ch 1 read enable
03 GPIO 5
Table 12: GPIO MUX pinout
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