ISL22429 Datasheet, PDF (12/13 Pages) Intersil Corporation – Low Noise, Low Power, SPI Bus, 128 Taps, Wiper Only

ISL22449
Examples:
A. Writing to the IVR:
This sequence will write a new value (77h) to the IVR2(non-volatile):
Set the ACR (Addr 1000b) for NV write (40h)
Send the ID byte, Instruction Byte, then the Data byte
010100001100100001000000
(Sent to SDI)
Set the IVR (Addr 0010b) to 77h
Send the ID byte, Instruction Byte, then the Data byte
010100001100001001110111
(Sent to SDI)
B. Reading from the WR:
This sequence will read the value from the WR3 (volatile):
Write to ACR first to access the volatile WRs
Send the ID byte, Instruction Byte, then the Data byte
010100001100100011000000
(Sent to SDI)
Read the data from WR3 (Addr 0011b)
Send the ID byte, Instruction Byte, then Read the Data byte
0101000010110011xxxxxxxx
(Out on SDO)
12
FN6333.3
July 17, 2009