- 您现在的位置：买卖IC网 > PDF目录378586 > DS12CR887 RTC with Constant-Voltage Trickle Charger PDF资料下载
参数资料
| 型号： | DS12CR887 |
| 英文描述： | RTC with Constant-Voltage Trickle Charger |
| 中文描述： | 带有恒压涓流充电器的RTC |
| 文件页数： | 17/22页 |
| 文件大小： | 1093K |
| 代理商： | DS12CR887 |
D
RTC with Constant-Voltage Trickle Charger
____________________________________________________________________
17
Bit 7: SET.
When the SET bit is 0, the update transfer
functions normally by advancing the counts once per
second. When the SET bit is written to 1, any update
transfer is inhibited, and the program can initialize the
time and calendar bytes without an update occurring in
the midst of initializing. Read cycles can be executed in
a similar manner. SET is a read/write bit and is not
affected by
RESET
or internal functions of the
DS12R885.
Bit 6: Periodic Interrupt Enable (PIE).
The PIE bit is a
read/write bit that allows the periodic interrupt flag (PF) bit
in Register C to drive the
IRQ
pin low. When the PIE bit is
set to 1, periodic interrupts are generated by driving the
IRQ
pin low at a rate specified by the RS3–RS0 bits of
Register A. A 0 in the PIE bit blocks the
IRQ
output from
being driven by a periodic interrupt, but the PF bit is still
set at the periodic rate. PIE is not modified by any internal
DS12R885 functions, but is cleared to 0 on
RESET
.
Bit 5: Alarm Interrupt Enable (AIE).
This bit is a
read/write bit that, when set to 1, permits the alarm flag
(AF) bit in Register C to assert
IRQ
. An alarm interrupt
occurs for each second that the three time bytes equal
the three alarm bytes, including a don’t-care alarm
code of binary 11XXXXXX. The AF bit does not initiate
the
IRQ
signal when the AIE bit is set to 0. The internal
functions of the DS12R885 do not affect the AIE bit, but
is cleared to 0 on
RESET
.
Bit 4: Update-Ended Interrupt Enable (UIE).
This bit is
a read/write bit that enables the update-end flag (UF)
bit in Register C to assert
IRQ
. The
RESET
pin going
low or the SET bit going high clears the UIE bit. UIE is
not modified by any internal DS12R885 functions, but is
cleared to 0 on
RESET
.
Bit 3: Square-Wave Enable (SQWE).
When this bit is
set to 1, a square-wave signal at the frequency set by
the rate-selection bits RS3–RS0 is driven out on the
SQW pin. When the SQWE bit is set to 0, the SQW pin
is held low. SQWE is a read/write bit and is cleared by
RESET
. SQWE is low if disabled, and is high imped-
ance when V
CC
is below V
PF
. SQWE is cleared to 0 on
RESET
.
Bit 2: Data Mode (DM).
This bit indicates whether time
and calendar information is in binary or BCD format.
The DM bit is set by the program to the appropriate for-
mat and can be read as required. This bit is not modi-
fied by internal functions or
RESET
. A 1 in DM signifies
binary data, while a 0 in DM specifies BCD data.
Bit 1: 24/12.
The 24/12 control bit establishes the for-
mat of the hours byte. A 1 indicates the 24-hour mode
and a 0 indicates the 12-hour mode. This bit is
read/write and is not affected by internal functions or
RESET
.
Bit 0: Daylight Savings Enable (DSE).
This bit is a
read/write bit that enables two daylight savings adjust-
ments when DSE is set to 1. On the first Sunday in
April, the time increments from 1:59:59 AM to 3:00:00
AM. On the last Sunday in October when the time first
reaches 1:59:59 AM, it changes to 1:00:00 AM. When
DSE is enabled, the internal logic tests for the first/last
Sunday condition at midnight. If the DSE bit is not set
when the test occurs, the daylight savings function
does not operate correctly. These adjustments do not
occur when the DSE bit is 0. This bit is not affected by
internal functions or
RESET
.
BIT 7
SET
BIT 6
PIE
BIT 5
AIE
BIT 4
UIE
BIT 3
SQWE
BIT 2
DM
BIT 1
24/12
BIT 0
DSE
Control Register B
相关PDF资料 |
PDF描述 |
|---|---|
| DS12CR887-33 | RTC with Constant-Voltage Trickle Charger |
| DS12CR887-5 | RTC with Constant-Voltage Trickle Charger |
| DS12CR885 | RTC with Constant-Voltage Trickle Charger |
| DS12CR887 | RTC with Constant-Voltage Trickle Charger |
| DS12CR887-33 | RTC with Constant-Voltage Trickle Charger |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS12CR887-33 | 功能描述:实时时钟 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 |
| DS12CR887-33+ | 功能描述:实时时钟 RTC w/Constant V Trickle Charger 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 |
| DS12CR887-5 | 功能描述:实时时钟 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 |
| DS12CR887-5+ | 功能描述:实时时钟 RTC w/Constant V Trickle Charger 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 |
| DS12R885-33 | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK MULTIPLEXED 114BYTE - Bulk |
发布紧急采购，3分钟左右您将得到回复。