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Q68000A7964 Datasheet(PDF) 9 Page - OSRAM GmbH |
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Q68000A7964 Datasheet(HTML) 9 Page - OSRAM GmbH |
9 / 14 page PD243X, PD353X, PD443X 2006-01-23 9 There are five registers within the display. Four of these registers are used to hold the ASCII/attribute code of the four display char- acters. The fifth register is the Control Word, which is used to blink, blank, clear, or dim the entire display, or to change the presenta- tion (attributes) of individual characters. Adressing The addresses within the display device are shown below. Digit 0 is the rightmost digit of the display, while digit 3 is on the left. Although there is only one Control Word, it is duplicated at the four address locations 0–3. Data can be read from any of these loca- tions. When one of these locations is written to, all of them will change together. Bit D7 of any of the display digit locations is used to allow an at- tribute to be assigned to that digit. The attributes are discussed in the next section. If Bit D7 is set to a one, that character will be dis- played using the attribute. If bit D7 is cleared, the character will dis- play normally. Control Word When address bit A2 is taken low, the Control Word is accessed. The same Control Word appears in all four of the lower address spaces of the display. Through the Control Word, the display can be cleared, the lamps can be tested, display brightness can be selected, and attributes can be set for any characters which have been loaded with their most significant bit (D7) set high. Brightness (D0, D1): The state of the lower two bits of the Control Word are used to set the brightness of the entire display, from 0% to 100%. The table below shows the correspondence of these bits to the brightness. Attributes (D2–D4): Bits D2, D3, and D4 control the visual attributes (i.e., blinking) of those display digits which have been written with bit D7 set high. In order to use any of the four attributes, the Cursor Enable bit (D4 in the Control Word) must be set. When the Cursor Enable bit is set, and bit D7 in a character location is set, the character will take on one of the following dis- play attributes. Control Word Format Address Contents A2 A1 A0 0 X X Control Word 1 0 0 Digit 0 (rightmost) 1 0 1 Digit 1 1 1 0 Digit 2 1 1 1 Digit 3 (leftmost) D7 D6 D5 D4 D3 D2 D1 D0 Operation 0 0 X X X X 0 0 Blank 0 0 X X X X 0 1 25% brightness 0 0 X X X X 1 0 50% brightness 0 0 X X X X 1 1 Full brightness X=don't care IDCW5163 Enable Attribute Blink Test Lamp Clear Attributes Brightness D7 D6 D5 D4 D3 D2 D1 D0 D1 D0 Brightness 0% (blank) 00 25% 01 1 50% 0 1 100% 1 Attributes Display cursor instead 1 0 0 D3 0 Display blinking cursor of character Blink character 0 1 D2 instead of character 1 with cursor Alternate character 1 Disable above attributes Attribute Enable D4 0 Enable above attributes 1 Blink entire display Blink attribute disabled Blink D5 1 0 Standard operation 1 D6 0 Display all dots at 50% brightness Lamp Test Clear entire display Standard operation 0 1 Clear D7 |
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