SC18IM704 datasheet(6/28 Pages) NXP

6 / 28 page

NXP Semiconductors

SC18IM704

UART to I2C-bus bridge

any GPIO pins programmed as output without having to write to SC18IM704 internal

IOState register.

002aac052

O CHAR.

DATA

P CHAR.

Figure 7. Write to output port

7.1.6 Read from GPIO port

The host issues the input port read command by sending an I character. This command

enables the host to quickly read any GPIO pins programmed as input without having to

read SC18IM704 internal IOState register.

Once the command is issued, SC18IM704 will read its internal IOState register and

returns its content to the host.

002aac053

I CHAR.

18IM responds

DATA

P CHAR.

Figure 8. Read from output port

7.1.7 Repeated START: read after write

SC18IM704 also supports ‘read after write’ command as specified in the NXP

Semiconductors I2C-bus specification. This allows a read command to be sent after a

write command without having to issue a STOP condition between the two commands.

The host issues a write command as normal, then immediately issues a read command

without sending a STOP (P) character after the write command.

002aac054

NUMBER

OF BYTES

S CHAR. TARGET ADR.

+ W

S CHAR.

NUMBER

OF BYTES

TARGET ADR.

+ R

DATA 0

DATA N

P CHAR.

18IM responds

DATA 0

DATA N

Figure 9. Repeated START: read after write

7.1.8 Repeated START: write after write

SC18IM704 also supports ‘write after write’ command as specified in the NXP

Semiconductors I2C-bus specification. This allows a write command to be sent after a

write command without having to issue a STOP condition between the two commands.

The host issues a write command as normal, then immediately issues a second write

command without sending a STOP (P) character after the first write command.

SC18IM704

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 1.0 — 22 September 2021

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