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参数资料
| 型号： | MCP79412-I/ST |
| 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： | 4.40 MM BODY, ROHS COMPLAINT, PLASTIC, TSSOP-8 |
| 文件页数： | 39/40页 |
| 文件大小： | 584K |
| 代理商： | MCP79412-I/ST |
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MCP7941X
DS22266C-page 8
2010-2011 Microchip Technology Inc.
FIGURE 3-2:
ACKNOWLEDGE TIMING
3.1.2
DEVICE ADDRESSING AND OPERATION
A control byte is the first byte received following the
Start condition from the master device (Figure 3-2).
The control byte consists of a control code; for the
MCP7941X this is set as ‘1010111X’ for read (0xAF)
and write (0xAE) operations for the EEPROM.
The control byte for accessing the SRAM and RTCC
registers are set to ‘1101111’ (0xDF for a read, 0xDE
for a write). The RTCC registers and the SRAM share
the same address space.
The last bit of the control byte defines the operation to
be performed. When set to a ‘1’ a read operation is
selected, and when set to a ‘0’ a write operation is
selected. The next byte received defines the address of
the data byte (Figure 3-3). The upper address bits are
transferred first, followed by the Least Significant bits
(LSb).
Following the Start condition, the MCP7941X monitors
the SDA bus, checking the device type identifier being
transmitted.
Upon
receiving
an
‘1010111’
or
‘1101111’
code,
the
slave
device
outputs
an
Acknowledge signal on the SDA line. Depending on the
state of the R/W bit, the MCP7941X will select a read
or write operation.
FIGURE 3-3:
ADDRESS SEQUENCE BIT ASSIGNMENTS
SCL
9
8
7
6
5
4
3
2
11
2
3
Transmitter must release the SDA line at this point
allowing the Receiver to pull the SDA line low to
acknowledge the previous eight bits of data.
Receiver must release the SDA line at this point
so the Transmitter can continue sending data.
Data from transmitter
SDA
Acknowledge
Bit
1
010
R/W
A7
A
0
EEPROM CONTROL BYTE
ADDRESS BYTE
CONTROL
CODE
{“A7” is ‘0’ for normal EEPROM
111
1
101
R/W
A7
A
0
SRAM RTCC CONTROL BYTE
ADDRESS BYTE
CONTROL
CODE
111
operations, but is used to access unique ID
location and STATUS register.)
相关PDF资料 |
PDF描述 |
|---|---|
| MCP79411T-I/ST | REAL TIME CLOCK, PDSO8 |
| MCP79411T-I/MNY | REAL TIME CLOCK, PDSO8 |
| MCP79411T-I/SN | REAL TIME CLOCK, PDSO8 |
| MCV14AT-I/SL | 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO14 |
| MCV14A-I/SL | 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO14 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MCP79412T-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 |
| MCP79412T-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 |
| MCP79412T-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 |
| MCP79510 | 制造商:MAS 制造商全称:MAS 功能描述:3V SPI Real-Time Clock Calendar with Battery Switchover |
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