SC18IM700IPW PHILIPS [NXP Semiconductors], SC18IM700IPW Datasheet - Page 6

• Manufacturer Part Number: SC18IM700IPW
• Description: Master I-2C - bus controller with UART interface
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
SC18IM700_1
Product data sheet
7.1.4 Read from 18IM internal register
7.1.5 Write to GPIO port
7.1.6 Read from GPIO port
7.1.7 Repeated START: read after write
The host issues the internal register read command by sending an R character followed
by the registers to be read. The frame is then terminated with a P character.
Once the command is issued, SC18IM700 will access its internal registers and returns the
contents of these registers to the host.
The host issues the output port write command by sending an O character followed by the
data to be written to the output port. This command enables the host to quickly set any
GPIO pins programmed as output without having to write to the SC18IM700 internal
IOState register.
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 the SC18IM700 internal IOState register.
Once the command is issued, SC18IM700 will read its internal IOState register and
returns its content to the host.
The SC18IM700 also supports ‘read after write’ command as specified in the Philips’
I
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.
2
Fig 6. Read from 18IM internal register
Fig 7. Write to output port
Fig 8. Read from output port
C-bus specification. This allows a read command to be sent after a write command
18IM responds
Rev. 01 — 28 February 2006
R CHAR.
DATA 0
REGISTER 0
O CHAR.
18IM responds
DATA N
I CHAR.
DATA
Master I
DATA
P CHAR.
002aac053
REGISTER N
2
C-bus controller with UART interface
P CHAR.
002aac052
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
P CHAR.
002aac051
SC18IM700
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