using the bootstrap loader
using the bootstrap loader
using the bootstrap loader
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
CONFIGURING THE FIRST STAGE<br />
3-22<br />
counter _base yort<br />
counter yort_ delta<br />
baud counter<br />
count<br />
The 16-bit port address of <strong>the</strong> base port used by <strong>the</strong><br />
baud rate timer. The port whose address you specify<br />
varies according to <strong>the</strong> type of timer device and, if<br />
applicable, <strong>the</strong> channel used on <strong>the</strong> device. The following<br />
list shows <strong>the</strong> ports for each of <strong>the</strong> valid timers. Specify<br />
<strong>the</strong> address of <strong>the</strong> port that corresponds to your timer<br />
device. The hardware reference manual for <strong>the</strong> CPU<br />
board lists <strong>the</strong> port addresses for <strong>the</strong>se serial devices.<br />
Timer Type<br />
8253<br />
8254<br />
80130<br />
80186<br />
82530 Channel A<br />
82530 Channel B<br />
Base Port<br />
Counter 0 Count Register Port<br />
Counter 0 Count Register Port<br />
ICW1 Register Port<br />
Use OFFOOH for all boards<br />
Channel A Command Register<br />
Port<br />
Channel B Command Register<br />
Port<br />
The number of bytes separating consecutive ports used<br />
by <strong>the</strong> timer.<br />
The number of <strong>the</strong> counter that is used for baud-rate<br />
generation. The following list identifies <strong>the</strong> possible<br />
counter numbers you can specify for each of <strong>the</strong> timers.<br />
Timer Type<br />
8253<br />
8254<br />
80130<br />
80186<br />
82530<br />
Counter Numbers<br />
0,1, or 2<br />
0,1, or 2<br />
2<br />
o or 1<br />
o<br />
A value that when loaded into <strong>the</strong> timer register<br />
generates <strong>the</strong> desired baud rate. The method of<br />
calculating this value follows <strong>the</strong>se parameter<br />
definitions.<br />
Bootstrap Loader