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RPC3G-914-64

更新时间： 2022-02-26 12:22:35

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RPC3G-914-64 数据手册

2.1.3 READ A BYTE FROM THE RPC3G

The sequence for a byte transfer from the RPC3G to the HOST (i.e. RX upload) is asynchronous and

proceeds as follows :-

RPC3G will assert RX Request line low to initiate transfer

Host pulls RX Accept low (i.e. request is accepted by the host)

RPC3G will turn on it's bus drivers, place LS nibble onto data lines

and negate RX Request (set to 1)

Host reads the data and negates RX Accept (i.e. data has been accepted)

Repeat steps 1-4 with MS nibble.

figure 8: RX upload timing diagram

Notes:

 The RPC3G will turn off it's data bus drivers after the entire packet has been uploaded to the HOST.

 See Appendix B and C. for example RPC3G driver subroutines.

2.2 HOST <> RPC3G PACKET FORMAT

2.2.1 THE CONTROL BYTE

The first byte of a RPC3G <> HOST packet transfer is always the CONTROL BYTE. This byte is used to control

the transfer and contains information about the type of packet, number of bytes to be transferred, memory

address, read/write bit etc. Bit 7 of the control byte is the Packet Type flag, PT, it determines the class of

transfer and the interpretation of the other bits in the control byte.

Radiometrix Ltd, RPC3G

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