IRMCS2033
Bit Position
7
6
5
4
3
2
1
0
1=Read/
Register Map Starting Address
0=Write
Command/Address Byte Format
Bit Position
7
6
5
4
3
2
1
0
1=Error/
Register Map Starting Address
0=OK
Command Acknowledgement Byte Format
The following example shows a command sequence sent from the host to the IRMCK203 requesting a two-byte
register write operation:
0x2F Write operation beginning at offset 0x2F
0x02 Byte count of register data is 2
0x00 Data byte 1
0x04 Data byte 2
0x35 Checksum (sum of preceding bytes, overflow discarded)
A good reply from the IRMCK203 would appear as follows:
0x2F Write completed OK at offset 0x2F
0x2F Checksum
An error reply to the command would have the following format:
0xAF Write at offset 0x2F completed in error
0xAF Checksum
RS-232 Register Read Access
A register read operation consists of a command/address byte, byte count and checksum. When the IRMCK203
receives the command, it validates the checksum and transmits the register data to the host.
Command / Address Byte
Command Acknowledgement Byte
Byte Count
Register Read Operation
Register Data (Byte Count bytes)
Checksum
Checksum
Register Read Acknowledgement (transfer OK)
This document is the property of International Rectifier and may not be copied or distributed without expressed consent.
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