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參數(shù)資料
| 型號： | BQ4845S |
| 英文描述： | Fast Recovery Glass Passivated Rectifier Diodes |
| 中文描述： | 實時時鐘 |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 1155K |
| 代理商： | BQ4845S |
Address Map
The bq4845 provides 16 bytes of clock and control status
registers. Table 1 is a map of the bq4845 registers, and
Table2 describes theregister bits.
Clock Memory Interface
The bq4845 has the same interface for clock/calendar
and control information as standard SRAM. To read and
write to these locations, the user must put the bq4845 in
theproper modeand meet thetiming requirements.
Read Mode
The bq4845 is in read mode whenever OE (Output en-
able) is low and CS (chip select) is low. The unique ad-
dress, specified by the 4 address inputs, defines which
one of the 16 clock/calendar bytes is to be accessed. The
bq4845 makes valid data available at the data I/O pins
within t
AA
(address access time). This occurs after the
last address input signal is stable, and providing the CS
and OE (output enable) access times are met. If the CS
and OE access times are not met, valid data is available
after the latter of chip select access time (t
ACS
) or output
enableaccess time(t
OE
).
CS and OE control the state of the eight three-state
data I/O signals. If the outputs are activated before t
AA
,
4
Ad-
dress
(h)
0
D7
0
D6
D5
D4
D3
D2
D1
D0
12-Hour
Range (h)
00–59
Register
Seconds
10-second digit
ALM0
10-second digit
10-minute digit
ALM0
10-minute digit
0
1-second digit
1
ALM1
1-second digit
00–59
Seconds alarm
2
0
1-minute digit
00–59
Minutes
3
ALM1
1-minute digit
00–59
Minutes alarm
4
PM/AM
ALM1
PM/AM
0
ALM1
0
0
10-hour digit
1-hour digit
01–12 AM/81– 92 PM
Hours
5
ALM0
10-hour digit
1-hour digit
01–12 AM/81–92 PM Hours alarm
6
7
8
9
A
0
10-day digit
10-day digit
0
0
1-day digit
1-day digit
Day-of-week digit
1-month digit
1-year digit
01–31
01–31
01–07
01–12
00–99
Day
Day alarm
Day-of-week
Month
Year
Programmable
rates
Interrupt en-
ables
Flags
Control
Unused
ALM0
0
0
10 mo.
10-year digit
B
*
WD2
WD1
WD0
RS3
RS2
RS1
RS0
C
*
*
AIE
PIE
PWRIE ABE
D
E
F
*
*
*
*
*
*
AF
UTI
*
PF
PWRF
24/12
*
BVF
DSE
*
STOP
*
*
*
Notes:
* = Unused bits; unwritable and read as 0.
0 = should be set to 0 for valid time/calendar range.
Clock calendar data in BCD. Automatic leap year adjustment.
PM/AM = 1 for PM; PM/AM = 0 for AM.
DSE = 1 enables daylight savings adjustment.
24/12 = 1 enables 24-hour data representation; 24/12 = 0 enables 12-hour data representation.
Day-of-Week coded as Sunday = 1 through Saturday = 7.
BVF = 1 for valid battery.
STOP = 1 turns the RTC on; STOP = 0 stops the RTC in back-up mode.
Table 1. bq4845 Clock and Control Register Map
Aug. 1995
bq4845/bq4845Y
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| BQ4845S- | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Parallel RTC With CPU Supervisor |
| BQ4845S-A4 | 功能描述:實時時鐘 w/NVSRAM Control Watchdog Timer RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| BQ4845S-A4G4 | 功能描述:實時時鐘 w/NVSRAM Control Watchdog Timer RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| BQ4845S-A4N | 功能描述:實時時鐘 w/NVSRAM Control Watchdog Timer RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| BQ4845S-A4NG4 | 功能描述:實時時鐘 w/NVSRAM Control Watchdog Timer RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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