STV9432TAP View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
STV9432TAP
STMicroelectronics
'STV9432TAP' PDF : 25 Pages View PDF
STV9432TAP
11 - SOFTWARE RESET REGISTER
403F
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RST
To perform a software I2C reset of the device, set the RST bit to ONE.
This bit will be automatically reset by the device.
Software Reset will put all Write registers at their default power-on value, and reset all internal logic
blocks except the I2C bus interface itself. It will not change the RAM contents.
12 - ON-SCREEN DISPLAY
The STV9432TAP on-screen display is able to dis-
play any line of characters (character strip) any-
where in the screen.
Character strings are programmed by the MCU in
RAM via I2C bus. Character shapes are coded in
the internal ROM font. Character strips may be
adjacent or separated by vertical spaces (Spacing
strips)
Consequently, one display page is made of a list
of Character strips and Spacing strips.
A Top Margin and a Left Margin are programmable
in dedicated registers.
12.1 - RAM PROGRAMMING
12.1.1 - Two kinds of Data
Strip Descriptors and Character Codes
An OSD screen is made of a number of Character
and Spacing strips.
There are two groups of Data that make one OSD
screen:
- a Strip Descriptors list,
- Text strings - one per Character strip.
Each Strip is associated with a 2 bytes Strip
Descriptor.
There are two kinds of Strip Descriptors:
- Character Strip Descriptors: they contain the
Text string Ram address of the Character Strip,
- Spacing Strip Descriptors: they specify the ver-
tical space height.
In the example shown in Figure 9, the OSD
screen, is made of 9 strips.
In RAM, there is:
- one list of 9 Strip descriptors
(size = 9 x 2 bytes = 18 bytes),
- 6 Text strings, each of them is made of the
character codes of the line of text.
Text strings can be programmed anywhere in
RAM. The Descriptor list can be located at 16 dif-
ferent addresses in RAM, this address is defined
in the Display Control Register.
It is consequently possible to store up to 16 differ-
ent pages in RAM.
The current Displayed page is specified in the Dis-
play Control Register. It refers to a given Page
Descriptor list.
Figure 9. Display Page: list of Character and Spacing strips
TOP MARGIN
Text line number one
Text line number two
Strip 1 : Character Strip
Strip 2 : Character Strip
Strip 3 : Spacing Strip
Text line number three
Strip 4 : Character Strip
Strip 5 : Spacing Strip
Text line number four
Text line number five
Text line number six
Strip 6 : Character Strip
Strip 7 : Character Strip
Strip 8 : Character Strip
Strip 9 : Spacing Strip (Bottom Margin)
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