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參數(shù)資料
| 型號： | SMS45 |
| 廠商： | Summit Microelectronics, Inc. |
| 英文描述： | Quad Programmable Precision Cascade Sequencer and Supervisory Controller with 4k-Bit Nonvolatile Memory |
| 中文描述： | 四可編程精密級聯(lián)序列和監(jiān)督控制器4K的位的非易失性內(nèi)存 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大小： | 993K |
| 代理商： | SMS45 |
14
SMS45
2079 1.2 05/24/04
SUMMIT MICROELECTRONICS, Inc.
Preliminary Information
Figure 10. START and STOP Conditions
2047 Table11 1.0
Table 11. Slave Addresses
START and STOP Conditions
When both the data and clock lines are high the bus is said
to be not busy. A high-to-low transition on the data line,
while the clock is high, is defined as the Start condition.
A low-to-high transition on the data line, while the clock
is high, is defined as the Stop condition. See Figure 10.
Acknowledge (ACK)
Acknowledge is a software convention used to indicate
successful data transfers. The transmitting device,
either the Master or the Slave, will release the bus after
transmitting eight bits. During the ninth clock cycle the
receiver will pull the SDA line low to Acknowledge that it
received the eight bits of data. The Master will leave the
SDA line high (NACK) when it terminates a read function.
The SMS45 will respond with an Acknowledge after recog-
nition of a Start condition and its slave address byte. If both
the device and a write operation are selected the SMS45
will respond with an Acknowledge after the receipt of each
subsequent 8-Bit word. In the READ mode the SMS45
transmits eight bits of data, then releases the SDA line, and
monitors the line for an Acknowledge signal. If an Acknowl-
edge is detected and no Stop condition is generated by the
Master, the SMS45 will continue to transmit data. If a
NACK is detected the SMS45 will terminate further data
transmissions and await a Stop condition before returning
to the standby power mode.
Device Addressing
Following a Start condition the Master must output the
address of the Slave it is accessing. The most significant
four bits of the Slave address are the device type
identifier/address. For the SMS45 the default is 1010
BIN
.
The next two bits are the Bus Address. The next bit (the
7th) is the MSB of the memory address.
Read/Write Bit
The last bit of the data stream defines the operation to be
performed. When set to 1 a Read operation is selected;
when set to 0 a Write operation is selected.
WRITE OPERATIONS
The SMS45 allows two types of Write operations: byte
Write and page Write. A byte Write operation writes a
single byte during the nonvolatile write period (t
WR
). The
page Write operation, limited to the memory array, allows
up to 16 bytes in the same page to be written during t
WR
.
Byte Write
After the Slave address is sent (to identify the Slave
device and select either a Read or Write operation), a
second byte is transmitted which contains the low order
8 bit address of any one of the 512 words in the array.
Upon receipt of the word address the SMS45 responds with
an Acknowledge. After receiving the next byte of data it
again responds with an Acknowledge. The Master then
terminates the transfer by generating a Stop condition, at
which time the SMS45 begins the internal Write cycle.
While the internal Write cycle is in progress the SMS45
inputs are disabled and the device will not respond to any
requests from the Master.
Page Write (memory only)
The SMS45 is capable of a 16-byte page Write operation.
It is initiated in the same manner as the byte Write
operation, but instead of terminating the Write cycle after
the first data word the Master can transmit up to 15 more
bytes of data. After the receipt of each byte the SMS45 will
respond with an Acknowledge.
The SMS45 automatically increments the address for
subsequent data words. After the receipt of each word the
low order address bits are internally incremented by one.
2047 Fig10
SCL
SDA In
START
Condition
STOP
Condition
7
D
B
S
M
6
D
5
D
4
D
3
D
2
D
1
D
0
B
D
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B
x
C
M
r
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2
C PROGRAMMING INFORMATION (CONTINUED)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SMS-450 | 制造商:3M Electronic Products Division 功能描述:80610754741 SMS 450 50MM (1.96 制造商:3M Electronic Products Division 功能描述:50MM 1.9685" RED SQUARES 制造商:3M Electronic Products Division 功能描述:SMS 450 50MM 1.9685 PC 6300450BK RED SQR |
| SMS450(1220MM) | 制造商:3M Electronic Products Division 功能描述:80610692404 SMS 450 BK 1,220MM RD SQ 6300450BK RD-SQ |
| SMS-450-BLK-1220MM | 制造商:3M Electronic Products Division 功能描述:80610692404 4FT STKS |
| SMS-450-RED-50MM | 制造商:3M Electronic Products Division 功能描述:80610754741 |
| SMS-452C | 功能描述:1.034X1.034X0.07-NON-VENTED SURF 制造商:leader tech inc. 系列:- 包裝:散裝 零件狀態(tài):在售 類型:蓋 高度 - 總:0.060"（1.52mm） 長度 - 總:1.058"（26.87mm） 寬度 - 總:1.058"（26.87mm） 通風(fēng):非通風(fēng) 安裝類型:表面貼裝 標準包裝:300 |
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