RPC-UHF RADIOMETRIX [Radiometrix Ltd], RPC-UHF Datasheet - Page 10

• Manufacturer Part Number: RPC-UHF
• Description: Radio Packet Controller
• Manufacturer: RADIOMETRIX [Radiometrix Ltd]

Host issues just the control byte, with bit 6 (W/R) cleared, bit 7 (PT) set and the memory address. The
RPC will respond with 2 bytes, the first is a control byte which is an echo of the control byte just issued
by the host, this is useful if the host is using an interrupt handler. The 2nd byte is the memory
contents.
RPC Memory WRITES:
Host issues 2 bytes, the first is the control byte with bit 6 (W/R) set, bit 7 (PT) set and the memory
address. The 2nd byte is the data to be written. The RPC does not give a response to memory writes.
Notes Memory writes to locations 01 to 3F, write to the non-volatile EEPROM in the RPC. The
Radiometrix Ltd, RPC
figure 11: Control byte for memory access
EEPROM has a limit of 100,000 write cycles therefor it's use must be
infrequently changed data. The RPC only writes to the EEPROM when instructed to by the
HOST. Each byte takes 10ms to write. To prevent accidental/spurious writes to EEPROM the
host must set the WE bit in SWITCHES prior to EACH byte to be written. We recommend that
the host performs a read/verify after each byte write to EEPROM.
The above does not apply to any memory reads nor to writes to SWITCHES (address 00h).
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