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PCF8545 датащи(PDF) 41 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) 41 Page - NXP Semiconductors

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NXP Semiconductors
PCF8545
Universal LCD driver for multiplex rates up to 1:8
013aaa464
data bus
CE
SUBADDRESS
DATA
DATA
DATA
Figure 32. Data transfer overview
The subaddress byte opens the communication with a read/write bit and a subaddress.
The subaddress is used to identify multiple devices on one SPI-bus.
Bit
Symbol
Value
Description
data read or write selection
0
write data
7
R/W
1
read data
6 to 5
SA[1:0]
01
subaddress; other codes cause the device to
ignore data transfer
4 to 0
-
unused
Table 30. Subaddress byte definition
After the subaddress byte, a control byte follows (see Section 8.1).
EXAMPLES
a) transmit two bytes of display RAM data
013aaa465
0 0 1
control byte
subaddress
RAM/command byte
RAM DATA
M
S
B
L
S
B
R/W = 0
0 0 1
0
1
b) transmit two command bytes
COMMAND
0 0 1
1 0
COMMAND
c) transmit one command byte and two display RAM date bytes
0 0
C
O
R
S
1
R
S
0
0
0
0
COMMAND
0 0 1
1 0
0 0
0
1
RAM DATA
RAM DATA
RAM DATA
Data transfers are terminated by de-asserting CE (set CE to logic 1).
Figure 33. SPI-bus write example
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
41 / 68



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