Matrix Orbital VK204-25 Legacy - Manual (Page 24)

Remembered Always
Examples
Crystal Speed 16 Mhz
Desired BAUD 13,500
speed =
crystalspeed
8 ∗ DesiredBaud
−1
speed = 148.15 − 1
speed =
16 , 000, 000
8 ∗ 13, 500
− 1
speed = 147.15
• LSB = 0x93 (rounded)
• MSB = 0x00
• Intended Baud Rate: 13,500 baud
Actual Baud Rate:
16 ,000,000
8 (147+1)
=13,514 Percent Difference: 0.1%
NOTES
• Results from the formula are rounded down to the nearest whole number (i.e 73.07
= 73).
• This formula becomes less acurate as baud rates increase, due to rounding.
• Place the speed result backwards into the formula to receive the actual baud rate.
(Baud = CrystalSpeed
8 (speed+1)
)
• The actual baud rate must be within 3% of the intended baud rate for the device to
communicate.
NOTES
• This command is not available in I 2 C mode.
5 Text
5.1 Introduction
The VK204-25 is an intelligent display module, designed to reduce the amount of code necessary to
begin displaying data. This means that it is able to display all ASCII formated characters and strings that are
sent to it, which are defined in the current character set. The display module will begin displaying text at the
top left corner of the display area, known as home, and continue to print to the display as if it was a page on
a typewriter. When the text reaches the bottom right row, it is able to automatically scroll all of the lines up
and continue to display text, with the auto scroll option set to on.
Matrix Orbital VK204-25 20