SDA9189X Datasheet, PDF (28/55 Pages) Siemens Semiconductor Group – Quarter PIP Processor

SDA 9189X
background box can be made transparent (CHARBCK = ‘0’), i.e. behind the characters
the inset picture becomes visible.
64 different characters are stored in a character ROM (see table 2). Each character is
defined by a pixel matrix consisting of 10 lines and 12 pixels per line.
2.6.2 Character Programming
The 5 characters per block are programmable via I²C Bus using a 7-bit code which is
identical with the ASCII code except for some of the special characters. The codes are
placed in a character RAM consisting of 45 cells. The size of the RAM is determined by
the number of characters per block (5) and the maximum number of PIP pictures (9 in
multi-PIP display modes). The character codes can be transmitted in two ways: each of
the 45 RAM locations can be reached separately by its 7-bit address or the RAM can be
written consecutively starting at an arbitrarily chosen position. In this case the RAM
address is increased automatically.
The 7-bit address consists of two parts: the 4 MSBs are used to choose one of the partial
pictures and the 3 LSBs to select one of the 5 characters per block.
Semiconductor Group
28
03.96