LPCXpresso Base Board rev B - User’s Guide
Page 40
Copyright 2011 © Embedded Artists AB
4.4.2
Dual UART SC16IS752 – U19
The dual UART SC16IS752, U19 (schematic page 10), can be connected either to the SPI-bus or the
I2C-bus.
For I2C interface (default), insert jumpers in J48 pin 2-3, J49 (schematic page 10), as
illustrated in Figure 40. Note that I2C mode is illustrated by yellow jumpers.
For SPI interface, insert jumpers in J48 pin1-2 and J50 (schematic page 10), as illustrated in
Figure 40. Note that SPI mode is illustrated by blue jumpers.
Note that J50 pin 7-8 is optional. It is the interrupt signal from the dual uart (U19) that can optionally be
connected to GPIO_33. If that is wanted, insert a jumper in J50 pin 7-8. See Figure 40 for details.
Insert all jumpers in J51 (schematic page 10) in order to connect uart channel A to the RS232 interface
(U18 and J52). See Figure 40 for details.
Connector J53 carries uart channel B that can be used for custom interface.
Note that some jumpers can interfere with the SPI-communication. J58 (schematic page 10) must not
be inserted. J41 (pin 1-2, schematic page 9) shall normally not be inserted unless only the 7-segment
display is used.
Figure 40 – Jumper Setting: SC16IS752, U19, in I2C/SPI Mode
J53
J51
J50 pin7-8
