SC18IS600_601_3

© NXP B.V. 2006. All rights reserved.

Product data sheet

Rev. 03 — 13 December 2006

14 of 28

NXP Semiconductors

SC18IS600/601

When the host issues a Read Buffer command, the SC18IS600/601 will return the data in

the read buffer on the MISO pin. Note that the Read Buffer will be overwritten if an

additional ‘Read N bytes’ or a ‘Read after write’ command is executed before the Read

Buffer command.

When the host issues this command, the SC18IS600/601 will first write N data bytes to

device.

6.6.6 SPI configuration

The SPI configuration command can be used to change the order in which the bits of SPI

data byte are sent on the SPI bus. In the LSB first configuration (SPI configuration data is

0x42), bit 0 is the first bit sent of any SPI byte. In MSB first (SPI configuration data is

0x81), bit 7 is the first bit sent. Table 9 shows the two possible configurations that can be

programmed.

Fig 16. Write after write

002aab721

NUMBER OF

BYTES 1

0x03

COMMAND

SLAVE 1

ADDRESS + W

SPI host sends

DATA

BYTE 1

DATA

BYTE N

NUMBER OF

BYTES 2

SLAVE 2

ADDRESS + W

DATA

BYTE 1

DATA

BYTE N

Fig 17. SPI configuration

Table 9.

SPI configuration

SPI configuration

Data order

0x42

LSB first

0x81

MSB first (default)

002aab722

0x18

COMMAND

SPI

CONFIGURATION

SPI host sends

CS

SCLK

MOSI

SPI configuration data

character 0x18