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參數(shù)資料
| 型號： | SMS47 |
| 廠商： | Summit Microelectronics, Inc. |
| 英文描述： | Quad Programmable Precision Cascade Sequencer and Supervisory Controller |
| 中文描述： | 四可編程精密級聯(lián)序列和監(jiān)督控制器 |
| 文件頁數(shù)： | 15/19頁 |
| 文件大?。?/td> | 923K |
| 代理商： | SMS47 |
15
2087 1.0 04/11/05
SMS47
SUMMIT MICROELECTRONICS, Inc.
Preliminary Information
Figure 11. Read and Write Operations
I
2
C PROGRAMMING INFORMATION (CONTINUED)
N
A
C
K
A
C
K
R
/
W
A
C
K
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
A
C
K
S
T
O
P
S
T
A
R
T
Writing Configuration Registers
Master
SDA
Slave
0 1
1 0
Master
SDA
Slave
C
7
C
6
C
5
C
4
C
3
C
2
C
1
C
0
A
C
K
R
/
W
A
C
K
S
T
A
R
T
C
7
C
6
C
5
C
4
C
3
C
2
C
1
C
0
Reading the Configuration Register
0 1
1 0
A
C
K
R
/
W
S
T
O
P
S
T
A
R
T
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
0 1
1 0
B
A
2
B
A
1
X
B
A
2
B
A
1
X
B
A
2
B
A
1
X
READ OPERATIONS
Read operations are initiated with the R/W bit of the
identification field set to 1. There are two different Read
options: 1. Current Address Byte Read, and 2. Random
Address Byte Read.
Random Address Read
Random address Read operations allow the Master to
access any register location in a random fashion. This
operation involves a two-step process. First, the Master
issues a write command which includes the start condition
and the Slave address field (with the R/W bit set to Write),
followed by the address of the word it is to Read. This
procedure sets the internal address counter of the SMS47
to the desired address. After the word address acknowl-
edge is received by the Master it immediately reissues a
Start condition, followed by another Slave address field
with the R/W bit set to READ. The SMS47 will respond with
an Acknowledge and then transmit the 8 data bits stored at
the addressed location. At this point the Master sets the
SDA line to NACK and generates a Stop condition. The
SMS47 discontinues data transmission and reverts to its
standby power mode.
Figure 12. Write Flow Chart
Next
Operation
a Write
ACK
Returned
Issue
Address
Proceed
With
Write
Await
Next
Command
Issue Stop
Issue Slave
Address and
R/W = 0
Issue Stop
Write Cycle
In Progress
Yes
No
Issue Start
Yes
No
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| SMS47GCR00 | Quad Programmable Precision Cascade Sequencer and Supervisory Controller |
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| SMS47GCR00 | 制造商:SUMMIT 制造商全稱:SUMMIT 功能描述:Quad Programmable Precision Cascade Sequencer and Supervisory Controller |
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| SMS47GCR04 | 制造商:SUMMIT 制造商全稱:SUMMIT 功能描述:Quad Programmable Precision Cascade Sequencer and Supervisory Controller |
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