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參數(shù)資料
| 型號： | UPD6708GS |
| 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)： | 17/72頁 |
| 文件大?。?/td> | 292K |
| 代理商： | UPD6708GS |
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17
μ
PD6708
(1)
Reading slave status (SSR) (control bit: 0H, 6H)
The master unit can learn the reason why the slave unit has not returned the acknowledge bit (ACK) by reading the
slave status.
The slave status is determined by the results of the last communication performed by the slave unit.
All the slave units can provide slave status information.
The meanings of the slave status are shown in Table 2-5.
Figure 2-2. Bit Configuration of Slave Status (SSR)
Table 2-5. Meanings of Slave Status
Bit
Value
Meaning
Bit 0
Note 1
0
Slave transmit buffer empty
1
Slave transmit buffer is not empty.
Bit 1
Note 2
0
Slave receive buffer empty
1
Slave receive buffer is not empty.
Bit 2
0
Unit is not locked.
1
Unit is locked.
Bit 3
0
Fixed to ‘0’
Bit 4
Note 3
0
Slave transmission ends
1
Slave transmission enabled
Bit 5
0
Fixed to ‘0’
Bit 7
00
Mode 0
Indicates the highest mode the unit
Bit 6
01
Mode 1
supports
Note 4
.
10
Mode 2
11
For future expansion
Notes 1.
The slave transmit buffer is the buffer accessed during data read processing (control bits: 3H, 7H).
With the
μ
PD6708, this buffer corresponds to the write data buffer (WDB) when the SETSD command is valid
(see
5.2.6 “SETSD command”
).
The slave receive buffer is the buffer accessed during data write processing (control bits: 8H, AH, BH, EH, FH).
With the
μ
PD6708, this buffer corresponds to the read data buffer (RDB).
The value of bit 4 can be selected by INIT command (see
5.2.1 “INIT command”
).
Because the
μ
PD6708 can support mode 2, bits 7 and 6 are fixed at ‘10’.
2.
3.
4.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
MSB
LSB
#
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