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| 型号： | MCP79412-I/MS |
| 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： | ROHS COMPLAINT, PLASTIC, MSOP-8 |
| 文件页数： | 5/40页 |
| 文件大小： | 584K |
| 代理商： | MCP79412-I/MS |
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2010-2011 Microchip Technology Inc.
DS22266C-page 13
MCP7941X
ALMxC2:0: These Configuration bits determine
the alarm match. The logic will trigger the alarm
based on one of the following match conditions:
0x18h-0x1Bh are used for the timesaver function.
These registers are loaded at the time when VCC falls
and the RTCC operates on the VBAT. The VBAT bit is
also set at this time. These registers are cleared when
the VBAT bit is cleared in software.
0x1Ch-0x1Fh are used for the timesaver function. Reg-
isters 0x18-0x1A are loaded when VCC falls and the
device switches over to VBAT. Registers 0x1B-0x1F are
loaded when VCC is available and the device switches
Power-Fail Time-Stamp for more information.
4.2
FEATURES
4.2.1
STATUS REGISTER
The STATUS register is in the nonvolatile EEPROM
array. To access the STATUS register, the address of
0xFFh is written to and read from. ACK polling may be
used to determine if the write is complete. The bits in
this register are defined as:
Bit 3:2 are the EEPROM array block protection
bits. These bits are in the nonvolatile EEPROM
array. This allows protection of the following
areas:
- 00 – None of the array is protected.
- 01 – The upper 1/4 of the array 0x60h-0x7fh
is protected.
- 10 – The upper 1/2 of the array 0x40h-0x7fh
is protected.
- 11 – All of the array 0x00-0x7fh is protected.
The unused bits are reserved at this time and
read as ‘0’.
With the current address read operation, the
address is not incremented. Consequently, the
subsequent reads are done from the same
location.
If multiple bytes are loaded to the STATUS register,
only the last byte is written.
4.2.2
UNLOCK SEQUENCE
The unique ID location is user accessible by using the
unlock ID sequence.
The unique ID location is 64-bits (8 bytes) and is
stored in EEPROM locations 0xF0 to 0xF7. This
location can be read at any time, however, a write is
inhibited until unlocked.
To unlock the write access to this location the following
sequence must be completed:
A single write of 0x55h to address 0x09. Stop
A single write of 0xAAh to address 0x09. Stop
This will allow the unique EEPROM locations to be
written.
After the byte or page write to these locations, the
write sequence is initiated by the Stop condition. At
this time, the ID locations are locked and no further
writes are possible to this location unless a complete
unlock sequence is repeated.
000
–
Seconds match
001
–
Minutes match
010
–
Hours match (takes into account 12/24
hour)
011
–
Matches the current day, interrupt at
12.00.00 a.m. Example: 12 midnight on
100
–Date
101
– RESERVED
110
– RESERVED
111
– Seconds, Minutes, Hour, Day, Date,
Month
Note:
It is strongly recommended that the
timesaver function only be used when the
oscillator is running. This will ensure
accurate functionality.
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| 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 |
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