UPD6708 datasheet(39/72 Pages) NEC

39 / 72 page

µPD6708

Table 6-2. Return Codes in Master Reception

Return Code Name

Code

Description

Master reception start

0100

This return code is generated when the master unit correctly receives the

message length code from the slave unit, informing the host controller of the

start of master reception.

Master receive data full

0101

Each time 20 bytes (RDB capacity) of master receive data is received, if RDB

is full, this return code makes a request to the host controller for a read of

receive data from RDB.

Master reception normal

0110

Indicates that reception of the number of data bytes specified by the message

termination

length bits has ended within one frame.

Termination during master

0111

Indicates that the communication has ended without completion of transmis-

reception

sion of the number of data bytes specified by the message length bits within

one frame.

Termination during master reception is not flagged if the unit loses once in

arbitration, and reception is attempted up to three times.

6.3

Return Codes in Slave Reception

Table 6-3 shows the return codes placed in STR when data or a command is received from the master unit.

Table 6-3. Return Codes in Slave Reception

Return Code Name

Code

Description

Slave reception start

1000

This return code is generated when the slave unit correctly receives the

message length codes from the master unit, informing the host controller of

the start of slave reception.

Slave receive data full

1001

Each time 20 bytes (RDB capacity) of slave receive data is received, if RDB is

full, this return code makes a request to the host controller for a read of receive

data from RDB.

Slave reception normal

1010

Indicates that reception of the number of data bytes specified by the message

termination

length bits has ended within one frame.

Termination during slave

1011

Indicates that the communication has ended without completion of transmis-

reception

sion of the number of data bytes specified by the message length bits within

one frame.

6.4

Return Codes in Broadcast Reception

Table 6-4 shows the return codes placed in STR when data or a command is received from the master unit in broadcast

communication.

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