PCA2117DUGSSLASHDA datasheet(72/107 Pages) NXP

72 / 107 page

PCA2117

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Product data sheet

Rev. 4 — 8 April 2015

72 of 107

NXP Semiconductors

PCA2117

Automotive LCD driver for character displays

9.3.1 SPI-bus data transfer

The chip enable signal is used to identify the transmitted data. Each data transfer is a

byte, with the MSB sent first.

The transmission is controlled by the active LOW chip enable signal CE. The first byte

transmitted is the subaddress byte.

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.

After the subaddress byte, a control byte follows (see Section 9.1). The purpose of this

byte is to indicate the content for the following data bytes (RAM, command or control

byte).

In this way, it is possible to send a mixture of RAM and command data in one access or

alternatively, to send just one type of data in one access.

Fig 50. SPI data transfer overview

Table 46.

Subaddress byte definition

Bit

Symbol

Value

Description

7R/W

data read or write selection

write data

read data

6to5

Subaddress; other codes cause the device to

ignore data transfer

4to0

unused

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