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参数资料
| 型号： | FM31L274-GTR |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO14 |
| 封装： | GREEN, MS-012AB, SOIC-14 |
| 文件页数： | 10/26页 |
| 文件大小： | 716K |
| 代理商： | FM31L274-GTR |
FM31L278/L276/L274/L272 - 3V I2C Companion
Rev. 2.0
Jan. 2011
Page 18 of 26
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 14. Single Byte Memory Write
Figure 15. 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 FM31L27x 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 FM31L27x 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
FM31L27x 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 FM31L27x 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 FM31L27x 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 FM31L27x
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 FM31L27x
Start
Address & Data
Stop
Acknowledge
Address LSB
A
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PDF描述 |
|---|---|
| FM31L274-G | SPECIALTY CONSUMER CIRCUIT, PDSO14 |
| FM31L278-GTR | SPECIALTY CONSUMER CIRCUIT, PDSO14 |
| FM31L278-G | SPECIALTY CONSUMER CIRCUIT, PDSO14 |
| FM31L276-GTR | SPECIALTY CONSUMER CIRCUIT, PDSO14 |
| FM31L276-G | SPECIALTY CONSUMER CIRCUIT, PDSO14 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| FM31L276 | 制造商:RAMTRON 制造商全称:RAMTRON 功能描述:3V Integrated Processor Companion with Memory |
| FM31L276-G | 功能描述:监控电路 64K w/RTC Pwr Mon WDT Bat Sw PF RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| FM31L276-GTR | 功能描述:监控电路 64K w/RTC Pwr Mon WDT Bat Sw PF RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| FM31L278 | 制造商:RAMTRON 制造商全称:RAMTRON 功能描述:3V Integrated Processor Companion with Memory |
| FM31L278_11 | 制造商:RAMTRON 制造商全称:RAMTRON 功能描述:3V Integrated Processor Companion with Memory |
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