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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 45/72頁 |
| 文件大?。?/td> | 292K |
| 代理商： | UPD6708CX |
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45
μ
PD6708
Table 7-2. Timing for Reading Transmit Data from WDB
(The minimum time after transmission start return code (0H) is set)
Transmit Data
Timing for Reading Transmit Data from WDB (
μ
s)
Mode 0
Mode 1
Mode 2
Transmit data (first byte)
Approx. 1580
Approx. 400
Approx. 290
Transmit data (second byte)
Approx. 3160
Approx. 800
Approx. 580
:
:
:
:
Transmit data (N-th byte)
Approx. 1580
×
N
Approx. 400
×
N
Approx. 290
×
N
7.2.2
Transmitting slave status address and lock address
When the
μ
PD6708 receives 0H, 4H, 5H, and 6H as control bits from the master unit, the slave status and lock address
are generated automatically and sent to the master unit. As a result, there is no necessity for the host controller to be involved
in the transmission of the slave status and lock address.
7.3
Master Reception
When a unit becomes a master unit by setting 0H, 3H, 4H, 5H, 6H, and 7H as control bits and executing the MREQ1
or MREQ2 command, and receives data, slave status and lock address from the slave unit, the following will occur.
(1)
When the master unit returns an acknowledge in the message length field, the slave address, control bits and message
length bits are placed in the read data buffer (RDB) by the MREQ1 command as shown in Figure 7-4, the “master reception
start” return code (6H) is placed in STR, and an interrupt request is generated.
Figure 7-4. Data Exchange During Master Reception (Contents of RDB)
(2)
(3)
Each time one byte of receive data is received, it is placed in RDB.
Each time 20 bytes (RDB capacity) of receive data are received, if RDB is full, a “master receive buffer full” return code
(5H) is placed in STR, and an interrupt request is generated.
After one frame of data is placed in RDB, a “master reception normal termination” return code (6H) is placed in STR
and an interrupt request is generated.
If a communication error occurs during reception and communication stops without receiving all of the data transmitted
from the slave unit, a “termination during master reception” return code (7H) is placed in STR and an interrupt request
is generated.
(4)
(5)
The areas where
μ
PD6708 places receive data, etc., in RDB are shown below.
Slave Address (12 Bits)
First Byte
Second Byte
Third Byte
Fourth Byte Onward
RDB
Message Length Bits
Control Bits
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