rpc2a-000-dil Radiometrix Ltd, rpc2a-000-dil Datasheet - Page 10

• Manufacturer Part Number: rpc2a-000-dil
• Description: Uhf Radio Packet Controller
• Manufacturer: Radiometrix Ltd

Host issues just the control byte, with bit 6 (W/R) cleared, bit 7 (PT) set and the memory address. The
RPC2A 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.
RPC2A 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 RPC2A does not give a response to memory writes.
Notes Memory writes to locations 01 to 3F, write to the non-volatile EEPROM in the RPC2A. The
Radiometrix Ltd, RPC2A
figure 11: Control byte for memory access
EEPROM has a limit of 100,000 write cycles therefor it's use must be restricted to infrequently
changed data. The RPC2A 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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