參數(shù)資料
型號(hào)： SDA20C440
廠商： SIEMENS A G
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, MICROCONTROLLER, PQFP80
封裝： PLASTIC, MQFP-80
文件頁(yè)數(shù)： 31/55頁(yè)
文件大?。?/td> 990K
代理商： SDA20C440
SDA 20C440
Semiconductor Group
37
LCDFRM.2:
reserved, to be set to 0
LCDFRM.3:
reserved, to be set to 0
LCDFRM.7:
reserved, to be set to 0
Default after reset:
X000 XX00
This register is bit-addressable.
Character Generation
The character generator interpretes each ASCII-character code written to the LCD-code register
(LCDCOD) and generates a 5
× 7 matrix character in the display RAM. The starting address is given
in the LCD-address register (LCDADR). The address is incremented five times during the
generation process, which starts after the write operation to special function register LCDCOD.
The character set is user definable and stored in a mask-programmable ROM. This ROM holds 128
character definitions. The character definitions have to be supported as an ASCII-file according to
the following syntax:
$CODE = XXH
00000
$CODE = yyH
11111
...
$END
Empty lines and lines beginning with ‘#’, ‘/’, ‘*’ are ignored and may be used to insert comments.
‘$CODE =’ and ‘$END’ are reserved keywords. The character code has to be given in hexadecimal
notation.
Single Bit Access
In addition to the character matrix produced by the character generator, each display RAM-field
holds five bits, which may be used for underlining characters (if 8-line displays are used) or to
access special segments of a user specific display (see figure 8). Addressed by the contents of
LCDADR, each single bit can be set or cleared by setting or clearing bit SB in register LCDBIT. The
address register LCDADR is incremented once after each write operation to LCDBIT. The range of
valid addresses depends on the selected display mode (see LCD-Special Function Registers).
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