PNI SENtral MandM - Manual (Page 33)

PNI Sensor Corporation Doc #1020129 revE
SENtral M&M Technical Datasheet Page 32
The parameter transfer process is invoked and terminated by appropriately setting the
ParamTransfer bit in the AlgorithmControl register. Ten (10) registers are used for the
transfer and for handshaking between SENtral and the host. One set of four registers is
allocated to upload a parameter value to SENtral, and another set of four registers is used to
retrieve a currently saved parameter from SENtral. Values shorter than four bytes can be
transferred using only some of the registers. Two registers implement the handshake
mechanism between SENtral and the host. Note that data is stored in little Endian format.
Parameter Load
Figure A2-1 shows the Parameter Load process by which the host loads parameter data into
SENtral.
Figure A2-1: Parameter Load Process
Initially the parameter values must be written into the LoadParamByte registers followed by
sending a non-zero parameter number into the ParamRequest register. The parameter
numbers are given in Table A2-2. The MSB of the ParamRequest register should be set
to ‘1’ to indicate a Load procedure. All five bytes can be written using a single I
2
C