Anonymous user
Serial Ports: Difference between revisions
m
small grammar error
| [unchecked revision] | [unchecked revision] |
(Added in where to find the COM port IO addresses) |
m (small grammar error) |
||
Line 87:
The serial controller (UART) has an internal clock which runs at 115200 ticks per second and a clock divisor which is used to control the baud rate. This is exactly the same type of system used by the Programmable Interrupt Timer (PIT).
In order to set the speed of the port, calculate the divisor required for the given baud rate and program that in to the divisor register. For example, a divisor of 1 will give
Do not be tempted to use a divisor of 0 to try to get an infinite baud rate, it won't work. Most serial controllers will generate a unspecified and unpredictable baud rate (and anyway infinite baud would mean infinite transmission errors as they are proportional.)
| |||