SC18IM700IPW PHILIPS [NXP Semiconductors], SC18IM700IPW Datasheet - Page 4

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

Philips Semiconductors
7. Functional description
SC18IM700_1
Product data sheet
7.1.1 Write N bytes to slave device
7.1 UART message format
The SC18IM700 is a bridge between a UART port and I
consists of a full-functional advanced UART. The UART communicates with the host
through the TX and RX pins. The serial data format is fixed: one start bit, 8 data bits, and
one stop bit. After reset the baud rate defaults to 9600 bit/s, and can be changed through
the Baud Rate Generator (BRG) registers.
After a power-up sequence or a hardware reset, the SC18IM700 will send two continuous
bytes to the host to indicate a start-up condition. These two bytes are 0x4F and 0x4B;
‘OK’ in ASCII.
The host initiates an I
registers through a series of ASCII commands.
supported by SC18IM700, and also their hexadecimal value representation.
Unrecognized commands are ignored by the device.
To prevent the host from handing the SC18IM700 due to an unfinished command
sequence, the SC18IM700 has a time-out feature. The delay between any two bytes of
data coming from the host should be less than 655 ms. If this condition is not met, the
SC18IM700 will time-out and clear the receive buffer. The SC18IM700 then starts to wait
for the next command from the host.
Table 3:
The host issues the write command by sending an S character followed by an I
slave device address, the total number of bytes to be sent, and I
with the first byte (DATA 0) and ends with the last byte (DATA N). The frame is then
terminated with a P character. Once the host issues this command, the SC18IM700 will
access the I
Note that the second byte sent is the I
bit (W) of this byte must be set to 0 to indicate this is an I
ASCII command
S
P
R
W
I
O
Z
ASCII commands supported by SC18IM700
2
C-bus slave device and start sending the I
Hex value
0x53
0x50
0x52
0x57
0x49
0x4F
0x5A
Rev. 01 — 28 February 2006
2
C-bus data transfer, reads from and writes to SC18IM700 internal
Command function
I
I
read SC18IM700 internal register
write to SC18IM700 internal register
read GPIO port
write to GPIO port
power down
2
2
C-bus START
C-bus STOP
2
C-bus device slave address. The least significant
Master I
Table 3
2
C-bus controller with UART interface
2
lists the ASCII commands
2
C-bus data bytes.
C-bus. The UART interface
2
C-bus write command.
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
2
C-bus data which begins
SC18IM700
2
C-bus
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