Analog Devices Blackfin Landscape LCD EZ-Extender ADZS-BFLLCD-EZEXT, Manual

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Blackfin Landscape LCD EZ-Extender Manual 2-7
Landscape LCD EZ-Extender Hardware Reference
AD7147 ADDR1 Jumper (JP7)
The AD7147
ADDR1
jumper (
JP7
) changes the second least significant
address bit used to interface to the AD7147 capacitive touch controller via
the TWI interface of the Blackfin processor. By default,
JP7
requires no
jumpers. When no jumper is installed, the
ADDR1
bit is pulled low and is a
logic ‘
0
’ (see Table 2-6 ).
Serial ROM Addr Jumper (JP8)
The serial ROM address jumper (
JP8
) can change the three least signifi-
cant address bits (
ADDR0—3
) used to interface to the serial ROM device via
the TWI interface of the Blackfin processor. By default,
JP8
requires no
jumpers. When no jumpers are installed, all three address bits are pulled
low and are logic ‘
0
’. This causes the serial ROM device select (address) to
default to a binary
1010 000
. To change any one of the three least signifi-
cant address bits to a logic ‘
1
’, install the respective jumper ( Table 2-7 ).
Table 2-5. JP6 Settings
Functionality JP6 Setting
Buffer (U4) drives 5 MHz on the PPI0CLK net No jumper installed (default)
Buffer (
U4
) is tri-stated Jumper installed
Table 2-6. JP7 Settings
AD7147 ADDR1 JP7 Setting
ADDR1 = logic ‘0’ No jumper installed (default)
ADDR1
= logic ‘1’ Jumper installed