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PD2436 Datasheet(PDF) 7 Page - OSRAM GmbH |
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PD2436 Datasheet(HTML) 7 Page - OSRAM GmbH |
7 / 11 page 2001 OSRAM Opto Semiconductors Inc.• San Jose, CA PD2535/6/7, PD3535/6/7, PD4435/6/7 www.infineon.com/opto • 408-456-4000 OSRAM Opto Semiconductors GmbH & Co. OHG • Regensburg, Germany www.osram-os.com • +49-941-202-7178 7 July 5, 2001-14 There are five registers within the display. Four of these regis- ters are used to hold the ASCII/attribute code of the four dis- play characters. The fifth register is the Control Word, which is used to blink, blank, clear, or dim the entire display, or to change the presentation (attributes) of individual characters. Addressing 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 locations. 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 attribute to be assigned to that digit. The attributes are dis- cussed in the next section. If Bit D7 is set to a one, that charac- ter will be displayed using the attribute. If bit D7 is cleared, the character will display normally. 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) 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 dis- play, from 0% to 100%. The table below shows the correspon- dence of these bits to the brightness. X=don't care 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 char- acter location is set, the character will take on one of the fol- lowing display attributes. D7 D6 D5 D4 D3 D2 D1 D0 Operation 0 0 XXXX0 0 Blank 0 0 XXXX0 1 25% brightness 0 0 XXXX1 0 50% brightness 0 0 XXXX1 1 Full brightness Control Word Format D7 D6 D5 D4 D3 D2 D1 D0 Clear Blink Attributes Brightness Lamp test Attribute enable D7 Clear 0 Standard Operation 1 Clear Entire Display D6 Lamp test 0 Standard Operation 1 Display All Dots at 50% Brightness D5 Blink 0 Blink Attribute Disabled 1 Blink Entire Display D4 Attribute enable 0 Disable above Attributes 1 Enable above Attributes D3 D2 Attributes 0 0 Display Cursor instead of Character 0 1 Blink Character 1 0 Display Blinking Cursor instead of Character 1 1 Alternate Character with Cursor D1 D0 Brightness 0 0 0% (blank) 0 1 25% 1 0 50% 1 1 100% |
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