UPD6708 datasheet(40/72 Pages) NEC

40 / 72 page

µPD6708

Table 6-4. Return Codes in Broadcast Reception

Return Code Name

Code

Description

Broadcast reception start

1100

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.

Broadcast receive data full

1101

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.

Broadcast reception normal

1110

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

termination

length bits has ended within one frame.

Termination during broadcast

1111

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.

6.5

Return Codes Generation Intervals

This section describes the generation order and the minimum generation interval for return codes generated each time

communication is performed,

Each time a new return code is generated, it is placed in STR without regard to STR read. For this reason, the host

controller must take account of the minimum return code generation interval in controlling the

µPD6708.

(1)

Master transmission

After execution of the MREQ1 or MREQ2 command, the order of generation of master transmission return codes is as

shown in Figure 6-1.

Figure 6-1. Return Code Generation Order in Master Transmission

The minimum generation intervals for return codes in master transmission are shown below.

Table 6-5. Minimum Generation Intervals for Return Codes in Master Transmission (

µs)

Time

Mode 0

Mode 1

Mode 2

Approx. 6325

Approx. 1605

Approx. 1160

Approx. 10

Approx. 7290

Approx. 2050

Approx. 1550

Transmission Start

(Return Code : 0000)

Termination During

Transmission

(Return Code : 0011)

Transmission

Normal Termination

(Return Code : 0010)

Termination During

Transmission

(Return Code : 0011)

New communication return codes

• Slave reception start

(Return code : 1000)

• Broadcast reception start

(Return code : 1100)

etc.

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