UPD77533 datasheet(45/104 Pages) RENESAS

номер детали	UPD77533

подробное описание детали	MOS INTEGRATED CIRCUIT

PDF	104 Pages

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производитель	RENESAS [Renesas Technology Corp]

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45 / 104 page

Data Sheet S15671EJ4V0DS

µµµµPD77533

13.2 Flow of Commands, Reponses, ACK, and NACK

13.2.1 ACK, NACK in case of local command

When the command is a local command, ACK and NACK are not used to confirm packet transmission/reception.

A response to the command (command execution result) is sent from the

µPD77533 to the host CPU instead of

ACK.

There is no equivalent to ACK for a command to which no response is returned (baud rate change command).

Even if NACK is sent from the host CPU to the

µPD77533, the latter does not re-send the packet.

Figure 13-1. Local Command Flow

PD77533

Host CPU

Command (CMD-ID = 0x31)

PD77533 version command transmitted

Error notification

PD77533 version response

Example of

normal flow

Response (CMD-ID = 0x31)

Command (CMD-ID = 0x31)

Timeout or error

occurrence

Command (CMD-ID = 0x31)

Response (CMD-ID = 0x31)

Error (CMD-ID = 0x3F)

PD77533 version command transmitted

PD77533 version response

Example of

abnormal flow

PD77533 version command transmitted

UPD77533 датащи(PDF) 45 Page - Renesas Technology Corp