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NJU3426 Datasheet(PDF) 5 Page - New Japan Radio |
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5 / 12 page -5 - NJU3426 (4) DISPLAY SHIFT OPERATION The display shift operation can be performed by changing the “Initial character address” of the “Command register 2”. And, the number of digits for the display shift in the loop is determined by the “Shifting display digits” of the “Command register 1”. In other words, shifting display area ranges from the “Initial character address” specified by the “Command register 2” to the last address designated by the “Command register 1”. The default value of the “Initial character address” is C1 (0,0,0,1), as shown in the table of “Display data RAM”. In addition, supposing that the value of the “Shifting display digits” is “N”, the “Initial character address” must be set in the range between C0 and CN in order not to exceed the digit “N”. Because the display shift operation doesn’t apply to the addresses beyond the range of the digit “N”, the display images, initially set, appear on these addresses. Just for reference, one character of display image is composed of 16 segments. HOW TO SET LEFT DISPLAY SHIFT The left display shift is carried out by incrementing the “Initial character address” gradually like C2, C3, C4, --- CN. To the contrary, decrementing the address performs right display shift. The following description provides the example on how to set the left display shift, using alphanumeric display images such as “0”, “1”, “2”, ---, “9”, “A”, “B”, ---, and “E”. STEP1) Setting display images in the display data RAM • Display RAM data Character address C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 Display image 0 1 2 3 4 5 6 7 8 9 A B C D E SETP2) Setting the “Initial character address” to C2 and the “Shifting display digits N” to 12 (T11). is not shifted. In this setting, the display images of "2", "3”,- - - appear on the T0, T1, T2, - - - T10 pins respectively, and the image “0” is on the T11 pin, which is assigned to the 12 th character address. The display images “D” and “E” don’t shift but remain on the T12 and T13 pins, assigned to the 13 th and 14th characters respectively, because their character addresses are outside of the digit “N”. STEP3) Changing the “Initial character address” to C3, and leaving the “Shifting display digits N” as 12 (T11). is not shifted. Shifting display digits C1 C2 C3 C0 C13 C14 T0 T1 T10 T11 T12 T13 C12 Character address Timing output terminals Character Display image 1 2 11 12 13 14 Shifting display digits C2 C3 C4 C1 C13 C14 T0 T1 T10 T11 T12 T13 C0 Character address Timing output terminals Character Display image 1 2 11 12 13 14 |
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