Table A-2 lists the configuration options. 0 ? surface mount resistors are used for all the
header positions.
Table A-2. BL1810 Jumper Configurations
Header
Description
n.c.
32K
Pins Connected
Factory
Default
JP1
SRAM Size
1–2
128K
×
2–3
512K
JP2
Flash Memory Size
1–2
128K/256K
×
2–3
512K
JP3
Flash Memory Bank Select
1–2
Normal Mode
×
2–3
Bank Mode
HV3 Sinking/Sourcing
D21
R55
Sinking
R56 Sourcing
×
RS-485 Bias and Termination
R17 Termination resistor
×
Resistors (not installed on
BL1820)
R16
R18
Bias resistors
×
NOTE: Header JP3 is available only on BL1810s labeled 175-0255. These boards were
introduced in 2003.
User ’s Manual
43
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