UPD77533 datasheet(42/104 Pages) RENESAS

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Data Sheet S15671EJ4V0DS

µµµµPD77533

12.4 Server Command Format

Server commands are stored in the DATA field of a packet in the format shown below.

Server commands are not in packet form when they are sent and received by the LS, so they must be “packeted”

by the host CPU.

Figure 12-5. Server Command Format

12.4.1 Header

Commands from and responses to the server have an ASCII character as the header (indicating the start of the

command or response).

Table 12-3. Header

Type

ASCII Character

Command

$ (0x24)

Response

! (0x21)

12.4.2 Command ID

The ID that identifies the type of command or response has a 2-byte ASCII character configuration (2 characters).

Table 12-4. Command ID

Type

ASCII Character

Command

Combination of 2 uppercase characters, A to Z

Response

Combination of 2 lowercase characters, a to z

12.4.3 Data field

The data field stores the data and status of the command or response.

1 byte

CMD-ID

FLAG

LENGTH

DATA

1 byte

Variable length

Number of bytes indicated by LENGTH

0x80

2 bytes

Header

End of

packet

Command ID

Data field

1 byte

2 bytes

Variable length

2 bytes

Checksum

$, !

0x0D, 0x0A

Unpacketed server command

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