參數(shù)資料
型號(hào)： UPD6708CX
廠商： NEC Corp.
英文描述： IEBusa Inter Equipment Busa PROTOCOL CONTROL LSI
中文描述： IEBusa設(shè)備布薩間協(xié)議控制大規(guī)模集成電路
文件頁(yè)數(shù)： 38/72頁(yè)
文件大小： 292K
代理商： UPD6708CX
38
μ
PD6708
6.
RETURN CODES
The
μ
PD6708 sets the communication status as a return code in lower 4 bits of the status register (STR) and requests
an interrupt (IRQ output). As a result of the interrupt request from the
μ
PD6708, the host controller can ascertain the
communication result by reading the return code in the status read mode.
6.1
Return Codes in Master/Slave Data Transmission
Table 6-1 shows the return codes placed in the status register when a unit has executed the MREQ1 or MREQ2 command
and becomes the master unit (including broadcast communication), and when the SETSD command is executed and the
slave unit transmits data.
Table 6-1. Return Codes in Master/Slave Transmission
Return Code Name
Code
Description
Transmission start
0000
Indicates that master/slave transmission will start. The point of generation differs
between master transmission and slave transmission.
<1>
Master transmission
Set when the master address field ends and the unit wins as the master
unit.
<2>
Slave transmission
Set when control bits (3H, 7H) which request data transmission are
received from the master unit.
Transmission normal termination
0010
Indicates that transmission of the number of data bytes specified by the message
length bits has ended within one frame.
Termination during transmission
0011
Indicates that the communication has ended without completion of transmission
of the number of data bytes specified by the message length bits within one frame.
In master transmission, termination during transmission is not flagged if the unit
loses once in arbitration, and transmission is attempted up to three times.
6.2
Return Codes in Master Reception
Table 6-2 shows the return codes placed in STR when a unit has executed the MREQ1 or MREQ2 command and becomes
the master unit, and receives data, a status or lock address from a slave unit.
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