UPD77533 datasheet(44/104 Pages) RENESAS

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Data Sheet S15671EJ4V0DS

µµµµPD77533

13.1 Format of ACK, NACK, Error Status

13.1.1 ACK

There are two types of ACK formats: ACK format 1 for server commands and ACK format 2 for extension

commands.

The

µPD77533 handles both these ACK types as “ACK”, regardless of which type is received. The host CPU can

use either of these ACK types, irrespective of the circumstances.

The

µPD77533 returns ACK to the host CPU in ACK format 1 in response to server commands and ACK format 2

in response to extension commands.

Table 13-2. ACK Format 1 (ACK Returned for Server Commands)

Field

Value

Number of Bytes

Description

CMD-ID

0x80

LENGTH

0x00

FLAG

0x03

Table 13-3. ACK Format 2 (ACK Returned for Extension Commands)

Field

Value

Number of Bytes

Description

CMD-ID

0x3F

LENGTH

0x01

DATA

0x00

ACK indicated by 0x00

FLAG

0x03

13.1.2 NACK, error status

Table 13-4. NACK, Error Status Format

Field

Value

Number of Bytes

Description

CMD-ID

0x3F

LENGTH

0x01

DATA

ErrStat

0x00: ACK (OK)

0x01: Format error

0x02: Timeout error

Undefined CMD-ID error

Else: Undefined

FLAG

0x03

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