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參數(shù)資料
| 型號： | UPD72042 |
| 廠商： | NEC Corp. |
| 英文描述： | LSI DEVICES FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL |
| 中文描述： | LSI器件間設(shè)備BusTM（IEBusTM）協(xié)議控制 |
| 文件頁數(shù)： | 19/92頁 |
| 文件大小： | 373K |
| 代理商： | UPD72042 |
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μ
PD72042
19
Data Sheet S14870EJ1V0DS00
Fig. 2-2 Slave Status (SSR) Bit Format
Table 2-5 Slave Status Meanings
Bit
Value
Meaning
Bit 0
Note 1
0
The slave transmission buffer is empty.
1
The slave transmission buffer is not empty.
Bit 1
Note 2
0
The slave reception buffer is empty.
1
The slave reception buffer is not empty.
Bit 2
0
The unit is not locked.
1
The unit is locked.
Bit 3
0
Fixed at 0
Bit 4
Note 3
0
Slave transmission disabled
1
Slave transmission enabled
Bit 5
0
Fixed at 0
Bit 7
00
Mode 0
Bit 6
01
Mode 1
10
Reserved for future expansion
11
Indicates the highest
mode supported by the
unit
Note 4
.
Notes 1.
The slave transmission buffer is accessed during a data read operation (control bits: 3H, 7H).
For the
μ
PD72042, this buffer corresponds to the TBF available when STRQ of the FLG register is set
to 1.
2.
The slave reception buffer is accessed during a data write operation (control bits: 8H, AH, BH, EH, FH).
For the
μ
PD72042, this buffer corresponds to the RBF available when SLRE of the FLG register is set
to 1.
3.
The value of bit 4 can be selected by using the UAR1 register.
4.
Bits 7 and 6 are currently fixed to 10 in the hardware of the
μ
PD72042.
(2) Data/command transfer (control bits: Read (3H, 7H), write (AH, BH, EH, FH))
When data read (3H, 7H) is set, the data in the data buffer of the slave unit is read into the master unit.
When data write (BH, FH) or command write (AH, EH) is set, the data received by the slave unit is processed
according to the operation specifications for the slave unit.
Remarks 1.
The user can select data and commands as necessary according to the system.
2.
3H, AH, and BH may cause locking, depending on the communication conditions and status.
MSB
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
LSB
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