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PCF8545 датащи(PDF) 32 Page - NXP Semiconductors

номер детали PCF8545
подробное описание детали  Universal LCD driver for multiplex rates up to 1:8
PDF  68 Pages
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производитель  NXP [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8545 датащи(HTML) 32 Page - NXP Semiconductors

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NXP Semiconductors
PCF8545
Universal LCD driver for multiplex rates up to 1:8
0 1 2 3 4 5 6 7
39 40 41 42 43
b0
b1
b2
b3
b4
b5
b6
b7
0
MSB
LSB
1
2
3
Transmitted data byte
b7
b6
b5
b4
b3
b2
b1
b0
Display RAM addresses (columns)/segment outputs (S)
Columns
Display RAM
bits (rows)/
backplane outputs
(BP)
Rows
013aaa455
Figure 20. Display RAM filling order in 1:4 multiplex drive mode
Depending on the start address of the data pointer, there is the possibility for a boundary
condition. This occurs when more data bits are sent than fit into the remaining RAM. The
additional data bits are discarded. See Figure 21.
0 1 2 3 4 5 6 7
39 40 41 42 43
b0
b1
b2
b3
b4
b5
b6
b7
0
MSB
LSB
1
2
3
Transmitted data byte
b7
b6
b5
b4
013aaa456
Discarded
Display RAM addresses (columns)/segment outputs (S)
Columns
Display RAM
bits (rows)/
backplane outputs
(BP)
Rows
Figure 21. Boundary condition in 1:4 multiplex drive mode
7.9.3 RAM filling in 1:6 multiplex drive mode
In the 1:6 multiplex drive mode the RAM is organized in six rows and 42 columns. The
eight transmitted data bits are placed in such a way, that a column is filled up (see
Figure 22).
PCF8545
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2021. All rights reserved.
Product data sheet
Rev. 2 — 4 October 2021
32 / 68



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