MC144144 Datasheet, PDF (31/44 Pages) Motorola, Inc – Enhanced Closed-Caption Decoder CMOS

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* Create a new screen display
*
*‘t’
*‘h’
*‘i’
*‘s’
*‘ ’
*‘w’
*‘a’
*‘s’
*‘ ’
*‘o’
*‘n’
*‘l’
*‘y’
*‘ ’
*‘a’
*‘ ’
*‘t’
*‘e’
*‘s’
*‘t’
*
* Return
*
*‘d’
*‘o’
*‘n’
*‘’’
*‘t’
*‘ ’
*‘p’
*‘a’
*‘n’
*‘i’
*‘c’
*‘.’
Using the Wait Command
The WAIT command will suspend serial port communica-
tions for a period of time. The TEXTSET example above
used the WAIT command in two ways. First to hold a display
on–screen for a period of time before taking a second action.
Then it was used to create a smooth scroll by timing the wait
to the scroll rate.
The WAIT command can also be used to control the ap-
pearance of two OSD displays in sequence without tying up
the master device for the total display time. In the following
example, the POPSET mode is used to pop on two sequen-
tial menu screens with a built in pause between the two dis-
plays. In this case the WAIT is placed just before the last
FLIP command. This allows the entire command sequence
to be sent to the MC144144 at once, since the RDY bit will be
set by the WAIT command, thus allowing the FLIP to be input
as well.
The command sequence would be as follows:
{33}
{ .. }
{ .. }
{ .. }
{36}
{38}
{ .. }
{ .. }
{ .. }
{A6,C0}
* select pop mode
* screen generation commands for first display
*”
”
”
”
”
*”
”
”
”
”
*
* FLIP cmd. Will flip memories, popping the first menu on–screen.
*
* OENM, to insure non–displayed memory is erased.
*
* screen generation commands for second display
*”
”
”
”
”
*”
”
”
”
”
*
* wait 6 seconds
{36}
* FLIP cmd. Will flip memories, popping the second menu on–screen.
MOTOROLA
MC144144
31