Jumper Settings
2-4 Blackfin Landscape LCD EZ-Extender Manual
AD7147 ADDR0 Jumper (JP1)
The AD7147 ADDR0 jumper (JP1) changes the least significant address bit
used to communicate to the AD7147 touch controller via the TWI inter-
face of the processor. By default, JP1 requires no jumpers. When no
jumper is installed, the ADDR0 bit is pulled low and is a logic ‘0’
(see Table 2-1).
LCD SPI Chip Select Jumper (JP2)
The LCD SPICS jumper (JP2) connects the chip select pin of the serial
peripheral interconnect (SPI) interface of the LCD display to one of three
SPI select pins of the Blackfin processor. JP2 allows you to choose any one
of the available SPI select pins (SPISEL1—3) of the processor
(see Table 2-2).
By default, JP2 is populated, so that the SPISEL1 pin of the expansion
interface II or the parallel peripheral interface (PPI) stamp connector can
be used. When the PPI stamp connector is used to attach the extender,
SPISEL3 is unavailable and only SPISEL1 and SPISEL2 are available for JP2.
Table 2-1. JP1 Settings
AD7147 ADDR0 JP1 Setting
ADDR0 = logic ‘0’ No jumper installed (default)
ADDR0 = logic ‘1’ Jumper installed
Table 2-2. JP2 Settings
Functionality JP2 Setting
LCD SPICS connected to SPISEL1 JP2.1 and JP2.2 (default)
LCD
SPICS connected to SPISEL2 JP2.3 and JP2.4
LCD SPICS connected to SPISEL3 JP2.5 and JP2.6
