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參數(shù)資料
| 型號： | FM32L276-GTR |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO14 |
| 封裝： | GREEN, MS-012AB, SOIC-14 |
| 文件頁數(shù)： | 5/21頁 |
| 文件大?。?/td> | 418K |
| 代理商： | FM32L276-GTR |
FM32L278/L276/L274/L272 - 3V I2C Companion
Rev. 3.1
July 2010
Page 13 of 21
user desires to abort a write without altering the
memory contents, this should be done using a Start
or Stop condition prior to the 8th data bit. The figures
below illustrate a single- and multiple-writes to
memory.
Figure 12. Single Byte Memory Write
Figure 13. Multiple Byte Memory Write
Memory Read Operation
There are two types of memory read operations. They
are current address read and selective address read. In
a current address read, the FM32L27x uses the
internal address latch to supply the address. In a
selective read, the user performs a procedure to first
set the address to a specific value.
Current Address & Sequential Read
As mentioned above the FM32L27x uses an internal
latch to supply the address for a read operation. A
current address read uses the existing value in the
address latch as a starting place for the read
operation. The system reads from the address
immediately following that of the last operation.
To perform a current address read, the bus master
supplies a slave address with the LSB set to 1. This
indicates that a read operation is requested. After
receiving
the
complete
device
address,
the
FM32L27x will begin shifting data out from the
current address on the next clock. The current address
is the value held in the internal address latch.
Beginning with the current address, the bus master
can read any number of bytes. Thus, a sequential read
is simply a current address read with multiple byte
transfers. After each byte the internal address counter
will be incremented.
Each time the bus master acknowledges a byte,
this indicates that the FM32L27x should read
out the next sequential byte.
There are four ways to terminate a read operation.
Failing to properly terminate the read will most likely
create a bus contention as the FM32L27x attempts to
read out additional data onto the bus. The four valid
methods follow.
1. The bus master issues a NACK in the 9th clock
cycle and a Stop in the 10th clock cycle. This is
illustrated in the diagrams below and is
preferred.
2. The bus master issues a NACK in the 9th clock
cycle and a Start in the 10th.
3. The bus master issues a Stop in the 9th clock
cycle.
4. The bus master issues a Start in the 9th clock
cycle.
If the internal address reaches the top of memory, it
will wrap around to 0000h on the next read cycle.
The figures below show the proper operation for
current address reads.
Selective (Random) Read
There is a simple technique that allows a user to
select a random address location as the starting point
for a read operation. This involves using the first
S
A
Slave Address
0
Address MSB
A
Data Byte
A
P
By Master
By FM32L27x
Start
Address & Data
Stop
Acknowledge
Address LSB
A
Data Byte
A
S
A
Slave Address 0
Address MSB
A
Data Byte
A P
By Master
By FM32L27x
Start
Address & Data
Stop
Acknowledge
Address LSB
A
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相關(guān)代理商/技術(shù)參數(shù) |
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| FM32L278 | 制造商:RAMTRON 制造商全稱:RAMTRON 功能描述:3V Integrated Processor Companion with Memory |
| FM32L278-G | 功能描述:F-RAM 256K w/Pwr Mon WDT Bat Sw PF Ser Num RoHS:否 存儲(chǔ)容量:512 Kbit 組織:64 K x 8 接口:SPI 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube 制造商:Cypress Semiconductor |
| FM32L278-GTR | 功能描述:F-RAM 256K w/Pwr Mon WDT Bat Sw PF Ser Num RoHS:否 存儲(chǔ)容量:512 Kbit 組織:64 K x 8 接口:SPI 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube 制造商:Cypress Semiconductor |
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