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| 型號(hào)： | LM79CCVFX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP44 |
| 封裝： | 10 X 10 MM, PLASTIC, QFP-44 |
| 文件頁數(shù)： | 7/31頁 |
| 文件大小： | 469K |
| 代理商： | LM79CCVFX |
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Functional Description (Continued)
2.2 Serial Bus Interface
When using the Serial Bus Interface a write will always con-
sist of the LM79 Serial Bus Interface Address byte, followed
by the Internal Address Register byte, then the data byte.
There are two cases for a read:
1.
If the Internal Address Register is known to be at the de-
sired Address, simply read the LM79 with the Serial Bus
Interface Address byte, followed by the data byte read
from the LM79.
2.
If the Internal Address Register value is unknown, write
to the LM79 with the Serial Bus Interface Address byte,
followed by the Internal Address Register byte. Then re-
start the Serial Communication with a Read consisting of
the Serial Bus Interface Address byte, followed by the
data byte read from the LM79.
In all other respects the LM79 functions identically for Serial
Bus communications as it does for ISA communications.
Auto-Increment does not operate. When writing to or reading
from a Register which Auto-Increments with ISA communica-
tions, the Register must be manually incremented for Serial
Bus communications.
The default power on Serial Bus address for the LM79 is:
0101101 binary. This address can be changed by writing any
desired value to the Serial Bus address register, which can
be done either via the ISA or Serial Bus. During and Serial
Bus communication on the BUSY bit (bit 7) in the address
register at x5h will be high, and any ISA activity in that situ-
ation should be limited to reading port x5h only.
All of these communications are depicted in the Serial Bus
Interface Timing Diagrams as shown in
Figure 7.
DS100036-10
(a) Serial Bus Write to the Internal Address Register followed by the Data Byte
DS100036-11
(b) Serial Bus Write to the Internal Address Register Only
DS100036-12
(c) Serial Bus Read from a Register with the Internal Address Register Preset to Desired Location
FIGURE 7. Serial Bus Timing
LM79
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