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| 型号： | MCP79411T-I/MNY |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | REAL TIME CLOCK, PDSO8 |
| 封装： | 2 X 3 MM, 0.75 MM HEIGHT, ROHS COMPLAINT, PLASTIC, TDFN-8 |
| 文件页数： | 11/40页 |
| 文件大小： | 584K |
| 代理商： | MCP79411T-I/MNY |
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2010-2011 Microchip Technology Inc.
DS22266C-page 19
MCP7941X
5.2
EEPROM
5.2.1
EEPROM BYTE WRITE
Following the Start condition from the master, the
control code and the R/W bit (which is a logic low) are
clocked onto the bus by the master transmitter. This
indicates to the addressed slave receiver that a byte
with a word address will follow after it has generated an
Acknowledge
bit
during
the
ninth
clock
cycle.
Therefore, the next byte transmitted by the master is
the word address and will be written into the Address
Pointer of the MCP7941X. After receiving another
Acknowledge signal from the MCP7941X, the master
device transmits the data word to be written into the
addressed
memory
location.
The
MCP7941X
acknowledges again and the master generates a Stop
condition. This initiates the internal write cycle, and,
during this time, the MCP7941X does not generate
Acknowledge signals for EEPROM write commands. If
an attempt is made to write to an address and the
protection is set then the device will acknowledge the
command but no write cycle will occur, no data will be
written, and the device will immediately accept a new
command. After a byte write command, the internal
address counter will point to the address location
following the one that was just written.
5.2.2
EEPROM PAGE WRITE
The write control byte, word address, and the first data
byte are transmitted to the MCP7941X in the same way
as in a byte write. But instead of generating a Stop
condition, the master transmits up to 7 additional bytes
(MCP7941X
has
an
8-byte
page),
which
are
temporarily stored in the on-chip page buffer and will be
written into memory after the master has transmitted a
Stop condition. After receipt of each word, the three
lower Address Pointer bits are internally incremented
by one. If the master should transmit more than 8 bytes
prior to generating the Stop condition, the address
counter will roll over and the data received previously
will be overwritten. As with the byte write operation,
once the Stop condition is received, an internal write
cycle will begin (Figure 5-4).
Note:
Page write operations are limited to writing
bytes within a single physical page,
regardless of the number of bytes actually
being
transmitted.
Physical
page
boundaries start at addresses that are
integer multiples of the page buffer size (or
‘page size’) and end at addresses that are
integer multiples of [page size - 1]. If a
page write command attempts to write
across a physical page boundary, the
result is that the data wraps around to the
beginning of the current page (overwriting
data previously stored there), instead of
being written to the next page as might be
expected. It is therefore necessary for the
application software to prevent page write
operations that would attempt to cross a
page boundary.
Note:
Addressing undefined EEPROM locations
will
result
in
the
MCP7941X
not
acknowledging the address.
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相关代理商/技术参数 |
参数描述 |
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| MCP79412 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:I2C? Real-Time Clock/Calendar with EEPROM, SRAM, Unique ID and Battery Switchover |
| MCP79412-I/MS | 功能描述:实时时钟 I2C GP RTCC 1Kb EE 64B SRAM EUI-64 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| MCP79412-I/SN | 功能描述:实时时钟 I2C GP RTCC 1Kb EE 64B SRAM EUI-64 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| MCP79412-I/ST | 功能描述:实时时钟 I2C GP RTCC 1Kb EE 64B SRAM EUI-64 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| MCP79412T-I/MNY | 功能描述:实时时钟 I2C GP RTCC 1Kb EE 64B SRAM EUI-64 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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