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PCA2117DUGS/DA Datasheet(PDF) 15 Page - NXP Semiconductors |
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PCA2117DUGS/DA Datasheet(HTML) 15 Page - NXP Semiconductors |
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15 / 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 15 of 107 NXP Semiconductors PCA2117 Automotive LCD driver for character displays 8.1.1.11 Command: Read_data The Read_data command reads binary 8-bit data from the CGRAM, CGROM, DDRAM or ICON-RAM. The Sel_mem_bank command (see Section 8.1.1.9) determines whether to read from the CGRAM, CGROM, DDRAM, or ICON-RAM. After reading, the address counter automatically increments or decrements by 1 in accordance with the setting of bit I_D of the Entry_mode_set command (see Section 8.1.2.3). Only bit 4 to bit 0 of the CGRAM or ICON-RAM data are valid. Bit 7 to bit 5 are set logic 0. 8.1.1.12 Command: Write_data The Write_data command writes binary 8-bit data to the CGRAM, DDRAM or ICON-RAM. The Sel_mem_bank command determines whether to write data into the CGRAM, DDRAM or ICON-RAM. After writing, the address counter automatically increments or decrements by 1 in accordance with the setting of bit I_D of the Entry_mode_set command (see Section 8.1.2.3). Only bit 4 to bit 0 of the CGRAM or ICON-RAM data are valid. Bit 7 to bit 5 are not implemented and should always be logic 0. The cursor and the character blink have to be turned off when writing to the CGRAM (see Table 25 on page 20). • The ICON-RAM to display mapping is given in Section 8.5.5 “ICON-RAM”. • The DDRAM to display mapping is given in Section 8.5.6 “DDRAM”. Table 16. Read_data - data read bit description Bit Symbol Value Description -R/W 1 fixed value - RS[1:0] 01 fixed value DDRAM and CGROM 7 to 0 RD[7:0] 00000000 to 11111111 read data from DDRAM and CGROM CGRAM and ICON-RAM 7 to 5 - 000 fixed value 4 to 0 RD[4:0] 00000 to 11111 read data from CGRAM and ICON-RAM Table 17. Write_data - data write bit description Bit Symbol Value Description -R/W 0 fixed value - RS[1:0] 01 fixed value DDRAM 7 to 0 WD[7:0] 00000000 to 11111111 write data to DDRAM CGRAM and ICON-RAM 7 to 5 - 000 not implemented 4 to 0 WD[4:0] 00000 to 11111 write data to CGRAM and ICON-RAM |
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