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PCA2117DUGS/DA 数据表(PDF) 18 Page - NXP Semiconductors |
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PCA2117DUGS/DA 数据表(HTML) 18 Page - NXP Semiconductors |
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18 / 107 page  PCA2117 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved. Product data sheet Rev. 4 — 8 April 2015 18 of 107 NXP Semiconductors PCA2117 Automotive LCD driver for character displays 8.1.2.4 Command: Function_set The Function_set command allows setting the display lines and the multiplex drive mode. [1] Default value. 8.1.2.5 Command: Inversion_mode The Inversion_mode command allows changing the drive scheme inversion mode. The waveforms used to drive an LCD (see Figure 27 to Figure 29) inherently produce a DC voltage across the display cell. The PCA2117 compensates for the DC voltage by inverting the waveforms on alternate frames or alternate lines. The choice of the compensation method is determined with INV[2:0] in Table 22. [1] Default value. Line inversion mode (driving scheme A): In line inversion mode, the DC value is compensated every nth line. Changing the inversion mode to line inversion mode reduces the possibility for flickering but increases the power consumption. Table 21. Function_set - function set bit description Bit Symbol Value Description -R/W 0 fixed value - RS[1:0] 10 fixed value 7 to 2 - 001100 fixed value 1M display lines setting 0[1] 1 line 40 characters 1 2 line 20 characters 0SL multiplex drive mode setting 0[1] 1:18 multiplex drive mode, 1 40 character or 2 20 character display 1 1:9 multiplex drive mode, 1 20 character display Table 22. Inversion_mode - inversion mode command bit description Bit Symbol Value Description -R/W 0 fixed value - RS[1:0] 10 fixed value 7 to 3 - 01000 fixed value 2 to 0 INV[2:0] inversion mode setting 000[1] frame inversion mode 001 1-line inversion mode 010 2-line inversion mode 011 3-line inversion mode 100 4-line inversion mode 101 5-line inversion mode 110 6-line inversion mode 111 7-line inversion mode |
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