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PCA9620 датащи(PDF) 45 Page - NXP Semiconductors |
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PCA9620 датащи(HTML) 45 Page - NXP Semiconductors |
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45 / 71 page ![]() PCA9620 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 1 — 9 December 2010 45 of 71 NXP Semiconductors PCA9620 Universal LCD driver for low multiplex rates The remaining bits are wrapped up into the next column. In order to fill the whole RAM addresses 45 bytes need to be sent to the PCA9620. After the last byte sent the data pointer is wrapped around to column 0 to start a possible RAM content update (see Figure 38). Even if a data byte is transmitted during the wrapping of the data pointer, all the bits in the byte will be written correctly. 7.9.1.5 RAM filling in 1:8 multiplex drive mode In the 1:8 multiplex drive mode the eight transmitted data bits are placed into eight rows of one display RAM column (see Figure 39). Fig 37. Display RAM filling order in 1:6 multiplex drive mode Fig 38. Data pointer wrap around in 1:6 multiplex drive mode 0 1 2 3 4 5 6 7 5556575859 a0 a1 a2 a3 a4 a5 a6 a7 0 MSB LSB 1 2 3 4 5 transmitted data bytes a7 a6 a5 a4 a3 a2 a1 a0 b0 b1 b2 b3 b4 b5 b6 c0 c1 c2 c3 c4 c5 c6 b7 c7 b7 b6 b5 b4 b3 b2 b1 b0 c7 c6 c5 c4 c3 c2 c1 c0 display RAM columns/segment outputs (S) columns display RAM rows/ backplane outputs (BP) rows 013aaa266 data pointer incrementation 0 1 2 3 4 5 6 7 5556575859 0 1 2 3 4 5 a7 a6 a5 a4 a3 a2 a1 a0 b7 b6 b5 b4 b3 b2 b1 b0 c7 c6 c5 c4 c3 c2 c1 c0 display RAM data pointer 013aaa290 wrap around |
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