z86131 ZiLOG Semiconductor, z86131 Datasheet - Page 49

• Manufacturer Part Number: z86131
• Description: Ntsc Line 21 Decoder
• Manufacturer: ZiLOG Semiconductor

ZiLOG
Using the WAIT Command
The WAIT command suspends serial port communications
for a period of time. The TEXTSET example on page 47
used the WAIT command in two ways. First to hold a dis-
play 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 fol-
lowing example, the POPSET mode is used to pop on two
DS007200-TVX0199
OSD
Command
{a3,74}
{a3,68}
{a3,69}
{a3,73}
{a3,20}
{a3,77}
{a3,61}
{a3,73}
{a3,20}
{a3,6f}
{a3,6e}
{a3,6c}
{a3,79}
{a3,20}
{a3,61}
{a3,20}
{a3,74}
{a3,65}
{a3,73}
{a3,74}
{30}
{a3,64}
{a3,6f}
{a3,6e}
{a3,27}
{a3,74}
{a3,20}
{a3,70}
{a3,61}
{a3,6e}
{a3,69}
{a3,63}
{a3,2e}
Function
*ÔtÕ
*ÔhÕ
*ÔiÕ
*ÔsÕ
*Ô Õ
*ÔwÕ
*ÔaÕ
*ÔsÕ
*Ô Õ
*ÔoÕ
*ÔnÕ
*'l'
*ÔyÕ
*Ô Õ
*ÔaÕ
*Ô Õ
*ÔtÕ
*ÔeÕ
*ÔsÕ
*ÔtÕ
*Return
*ÔdÕ
*ÔoÕ
*ÔnÕ
*ÔÕ Õ
*ÔtÕ
*Ô Õ
*ÔpÕ
*ÔaÕ
*ÔnÕ
*ÔiÕ
*ÔcÕ
*Ô.Õ
P R E L I M I N A R Y
sequential menu screens with a built-in pause between the
two displays. In this case, the WAIT is placed just before
the most recent FLIP command, thereby allowing the entire
command sequence to be sent to the Z86129. The RDY bit
is set by the WAIT command, thus allowing the FLIP to be
input as well.
The command sequence would be as follows:
Using The Graphics Character Set
The following example creates an OSD screen which illus-
trates several features of the Z86129 including the use of
the Graphics character set to generate a large font word. The
particular features presented are purely for demonstration
purposes and not intended to suggest a particular applica-
tion.
For the sake of brevity, the “text” to be displayed is pre-
sented as a string within quotes rather than as the actual
command sequences required. Single quotes (‘ ’) signifies
standard characters while double quotes (“ ”) signifies Dou-
ble-Wide characters.
OSD
Command
{33}
{ .. }
{ .. }
{ .. }
{36}
{38}
{ .. }
{ .. }
{ .. }
{A6,C0}
{36}
OSD
Command
{33}
{A0,02}
{A2,00}
{A3,03}
ÒTHIS IS A DEMONSTRATION OF OSDÓ
{A0,03}
{A2,00}
Function
*select pop mode
*screen generation commands for Þrst dis-
play
*FLIP command ßips memories, and pops
the Þrst menu on-screen.
*OENM, to ensure non-displayed memory
is erased.
*screen generation commands for second
display
*wait 6 seconds
*FLIP command ßips memories, and pops
the second menu on-screen.
Function
*select pop mode
*select poprow 2
*Move cursor to 0
*PAC, GREEN chars
*select poprow 3
*cursor to 0
NTSC Line 21 Decoder
Z86129/130/131
49