Rainbow Electronics DS2482-800 - Manual (Page 10)

DS2482-800: Eight-Channel 1-Wire Master
10 of 22
Set Read Pointer
Command Code E1h
Command Parameter Pointer Code
Description
Sets the read pointer to the specified register. Overwrites the read pointer
position of any 1-Wire communication command in progress.
Typical Use
To prepare reading the result from a 1-Wire Byte command; random read
access of registers.
Restriction None (can be executed at any time)
Error Response
If the pointer code is not valid, the pointer code will not be acknowledged
and the command will be ignored.
Command Duration
None; the read pointer is updated on the rising SCL edge of the pointer
code acknowledge bit.
1-Wire Activity Not Affected
Read Pointer Position As Specified by the Pointer Code
Status Bits Affected None
Configuration Bits Affected None
Valid Pointer Codes
Write Configuration
Command Code D2h
Command Parameter Configuration Byte
Description
Writes a new configuration byte. The new settings take effect immediately.
NOTE: When writing to the Configuration Register, the new data is
accepted only if the upper nibble (bits 7 to 4) is the one's complement of
the lower nibble (bits 3 to 0). When read, the upper nibble is always 0h.
Typical Use Defining the features for subsequent 1-Wire communication.
Restriction
1-Wire activity must have ended before the DS2482 can process this
command.
Error Response
Command code and parameter will not be acknowledged if 1WB = 1 at the
time the command code is received and the command will be ignored.
Command Duration
None; the configuration register is updated on the rising SCL edge of the
configuration byte acknowledge bit.
1-Wire Activity None
Read Pointer Position Configuration Register (to verify write)
Status Bits Affected RST set to 0
Configuration Bits Affected 1WS, SPU, PPM, APU updated
Register Selection Code
Status Register F0h
Read Data Register E1h
Channel Selection Register D2h
Configuration Register C3h