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参数资料
| 型号： | M48T37Y-70MH1 |
| 厂商： | 意法半导体 |
| 英文描述： | 3.3V-5V 256 Kbit 32Kb x8 TIMEKEEPER SRAM |
| 中文描述： | 3.3 - 5V的256千位的32KB的SRAM x8计时器 |
| 文件页数： | 11/20页 |
| 文件大小： | 128K |
| 代理商： | M48T37Y-70MH1 |
11/20
M48T37Y, M48T37V
CLOCK OPERATIONS
Reading the Clock
Updates to the TIMEKEEPER registers should be
halted beforeclock data is read to prevent reading
data in transition. Because the BiPORT TIME-
KEEPER cellsin the RAM array are only data reg-
isters, and not the actual clock counters, updating
the registers can be halted without disturbing the
clock itself.
Updating is halted when a ‘1’ is written to the
READ bit, D6 in the Control Register 7FF8h. As
long as a ‘1’ remains in that position, updating is
halted. After a halt is issued, the registers reflect
the count; that is, the day, date, and the time that
were current at the moment the haltcommandwas
issued.
All of the TIMEKEEPER registers are updated si-
multaneously. A halt will not interrupt an update in
progress. Updating will resumewithin a secondaf-
ter the bit is reset to a ’0’.
Setting the Clock
Bit D7 of the Control Register (7FF8h) is the
WRITE bit. Setting the WRITE bit to a ‘1’, like the
READ bit, halts updatesto the TIMEKEEPER reg-
isters. The user can then load them with the cor-
rect day, date, and time data in 24 hour BCD
format (see Table 11). Resetting the WRITE bit to
a ‘0’ then transfers the values of all time registers
(7FF1h, 7FF9h-7FFFh) to the actual TIMEKEEP-
ER counters and allows normal operation to re-
sume. After the WRITE bit is reset, the next clock
update will occur in approximately one second.
Note
: Upon power-up following a power failure,
both the WRITE bit and the READ bit will be reset
to ’0’.
Keys:
S = Sign Bit
FT = Frequency Test Bit
R = Read Bit
W = Write Bit
ST = Stop Bit
0 = Must be set to ’0’
BL = Battery Low Flag
BMB0-BMB4 = Watchdog Multiplier Bits
AFE = Alarm Flag Enable Flag
RB0-RB1 = Watchdog Resolution Bits
WDS = Watchdog Steering Bit
ABE = Alarm in Battery Back-Up Mode Enable Bit
RPT1-RPT4 = Alarm Repeat Mode Bits
WDF =Watchdog Flag
AF = Alarm Flag
Z = ’0’ and are Read only
Table 11. Register Map
Address
Data
Function/Range
BCD Format
D7
D6
D5
D4
D3
D2
D1
D0
7FFFh
10 Years
Year
Year
00-99
7FFEh
0
0
0
10 M
Month
Month
01-12
7FFDh
0
0
10 Date
Date: Day of Month
Date
01-31
7FFCh
0
FT
0
0
0
Day of Week
Day
01-7
7FFBh
0
0
10 Hours
Hours
Hour
00-23
7FFAh
0
10 Minutes
Minutes
Min
00-59
7FF9h
ST
10 Seconds
Seconds
Sec
00-59
7FF8h
W
R
S
Calibration
Control
7FF7h
WDS
BMB4
BMB3
BMB2
BMB1
BMB0
RB1
RB0
Watchdog
7FF6h
AFE
0
ABE
0
0
0
0
0
Interrupts
7FF5h
RPT4
0
AIarm 10 Date
Alarm Date
Alarm Date
01-31
7FF4h
RPT3
0
AIarm 10 Hours
Alarm Hours
Alarm Hour
00-23
7FF3h
RPT2
Alarm 10 Minutes
Alarm Minutes
Alarm Min
00-59
7FF2h
RPT1
Alarm 10 Seconds
Alarm Seconds
Alarm Sec
00-59
7FF1h
1000 Year
100 Year
Century
00-99
7FF0h
WDF
AF
Z
BL
Z
Z
Z
Z
Flags
相关PDF资料 |
PDF描述 |
|---|---|
| M48T37V-10MH1 | 3.3V-5V 256 Kbit 32Kb x8 TIMEKEEPER SRAM |
| M48T37Y-10MH1 | 3.3V-5V 256 Kbit 32Kb x8 TIMEKEEPER SRAM |
| M48T37VSH | 3.3V-5V 256 Kbit 32Kb x8 TIMEKEEPER SRAM |
| M48T37YMH | TRANS PREBIASED DUAL NPN SOT363 |
| M48T37Y-70MH6TR | TRANS PREBIASED DUAL PNP SOT-363 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T37Y-70MH1E | 功能描述:实时时钟 256K (32Kx8) 70ns 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 |
| M48T37Y-70MH1F | 功能描述:实时时钟 256K (32Kx8) 70ns 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 |
| M48T37Y-70MH1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER? SRAM |
| M48T37Y-70MH6 | 功能描述:实时时钟 256K (32Kx8) 70ns 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 |
| M48T37Y-70MH6E | 功能描述:实时时钟 256K (32Kx8) 70ns 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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