UPD77533 datasheet(41/104 Pages) RENESAS

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Data Sheet S15671EJ4V0DS

µµµµPD77533

12.2 Packet Division

The total length of the data in an unpacketed state in a server command or server command response sometimes

exceeds 255 bytes. In this case, the host CPU cannot fit all the data in a single packet, and therefore divides the

data into multiple packets.

The data in local or extension commands cannot be divided and sent in multiple packets; the command must fit

completely into a single packet.

Figure 12-2. Example of Single Packet

Figure 12-3. Example of Data Divided into Multiple Packets

12.3 Extension Command Format

Extension commands (CMD-ID = 0x7F) contain an additional EXT-ID field, which identifies the command.

Figure 12-4. Extension Command Format

FLAG

DATA

CMD-ID

Original data

FLAG

= 0x03

FLAG

DATA

CMD-ID

Original data

FLAG = 0x03

FLAG

DATA

CMD-ID

FLAG

DATA

CMD-ID

FLAG = 0x02

1 byte

CMD-ID

FLAG

LENGTH

DATA

1 byte

Variable length

Number of bytes indicated by LENGTH

1 byte

EXT-ID

0x7F

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