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INITIAL_SLV_BAUD_DIV
Default is 0. If the clone is faster than, or might be faster than, the master, increase this macro to the
value needed to achieve the fastest common baud rate that works on both boards. Zero will always
work when the clone crystal speed is equal to the master crystal speed. (This is the value that goes in
the divisor register, the actual divisor is this plus 1.)
The divisor register value is determined as follows:
32 × baud rate
Divisor Register Value
(Crystal Frequency (in Hz))
= ------------------------------------------------------------------ – 1
For achievable baud rates, this should within 4% of an integral value. The maximum baud rate is the
crystal frequency (in Hz) divided by 32. Note that if CL_DOUBLE_CLONE_CLOCK = 1, the crystal
frequency is doubled in the above calculation.
STERILE_CLONES
Default is 0: cloned boards will check for the presence of a cloning cable. Set to 1 to cause cloned
boards to bypass the check for the cloning cable, thereby disabling cloning of clones.
In some core modules the default is 1 and cannot be changed, thus making all clones sterile. A com-
piler error is generated if an attempt is made to define this macro to “0” on a core module that does not
support non-sterile clones.
CLONINGBAUDRATE (Dynamic C versions prior to version 7.20 only)
Default is 1: baud rate is 115,200 bps. Set to 0 to use 57,600 bps. This macro is not applicable when
ENABLE_FAST_CLONING is set to 1.
All controllers sold by Rabbit Semiconductor with the Rabbit 2000 ? or the Rabbit 3000 ? chip support
cloning at 115,200 bps. If you have a custom designed Rabbit-based controller with a crystal that does
not support a baud rate of 115,200 bps, change this macro to zero and the baud rate will be 57,600 bps.
ENABLE_FAST_CLONING (Dynamic C versions 7.05 to 7.10 only)
Default is 0: fast cloning is not enabled. Set to 1 to enable fast cloning.
This macro was made available to speed up the cloning process, with some restrictions. See the
description of the ENABLE_FAST_CLONING macro near the beginning of RABBITBIOS.C for
details.
The cloning implementation in Dynamic C version 7.20 transfers data at the fastest possible speed
allowed by the crystal frequency, making the ENABLE_FAST_CLONING macro unnecessary.
Summary
The Rabbit Cloning Board is an easy-to-use, inexpensive solution for low production cloning. It is fast,
flexible and reliable.
TN207
7
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