Rabbit 2000, Getting Started Manual

Page: 47 / 54

User’s Manual 43
Table A-2 lists the configuration options. 0
Ω
surface mount resistors are used for all the
header positions.
NOTE: Header JP3 is available only on BL1810s labeled 175-0255. These boards were
introduced in 2003.
Table A-2. BL1810 Jumper Configurations
Header Description Pins Connected
Factory
Default
JP1 SRAM Size
n.c. 32K
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
Resistors (not installed on
BL1820)
R17 Termination resistor
×
R16
R18
Bias resistors
×
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