Digital PMR Radio Processor
CMX7131/CMX7141
6.5.19 Reset/Abort
From each Rx or Tx mode, a Reset/Abort aborts the current state machine and drops into the
corresponding (Rx or Tx) Idle mode. The only difference between this and going directly into the
corresponding Idle mode is that all of the buffers and filters are flushed out first with Reset/Abort.
6.5.20 Data Transfer
Payload data is transferred from/to the host using blocks of five Rx and five Tx 16-bit C-BUS registers,
allowing up to 72 bits (9 bytes) of data to be transferred in sequence. The lowest 8 bits of the register block
are reserved for a Byte Counter, Block ID and a Transaction Counter. The byte count indicates how many
bytes in the data block are valid and avoids the need to perform a full five word C-BUS read/write if only a
smaller block of data need to be transferred. If a data transfer does not consist of an integer number of
bytes, then the final byte transfer should be padded with zeroes up to the byte boundary.
2014 CML Microsystems Plc
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