UPD77533 datasheet(52/104 Pages) RENESAS

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Data Sheet S15671EJ4V0DS

µµµµPD77533

15.1.2 Processing of baud rate change command (“Set Baud Rate”)

The baud rate change command is processed as follows.

(1) A response to the command is created and sent to the LS.

(2) The system waits until response transmission is complete.

(3) The baud rate is changed in accordance with the command.

15.2 Set Baud Rate

This command is used to change the baud rate between the host CPU and the LS.

This command must be processed by the host CPU; it is not processed by the

µPD77533.

Figure 15-1. Set Baud Rate Flow

15.2.1 $BD

Table 15-3. $BD Format (in Unpacketed State)

Section

Number of Bits

Format

Description

Header

−

Command ID

−

Data

Baud rate

unsigned

See Table 15-5 List of Baud Rates

Checksum

−

Checksum

End-of-packet

−

<0x0D><0x0A>

15.2.2 !bd

Table 15-4. !bd Format (in Unpacketed State)

Section

Number of Bits

Format

Description

Header

−

Command ID

−

Data

Result code

unsigned

0 = OK

Else = Error

Baud rate

unsigned

See Table 15-5 List of Baud Rates

Checksum

−

Checksum

End-of-packet

−

<0x0D><0x0A>

PD77533

Host CPU

!bd

$BD

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