參數(shù)資料
型號(hào)： RX-4045NBAA
元件分類： XO, clock
英文描述： REAL TIME CLOCK, PDSO22
封裝： ROHS COMPLIANT, SON-22
文件頁(yè)數(shù)： 37/37頁(yè)
文件大?。?/td> 554K
代理商： RX-4045NBAA
RX - 4045 SA / NB
Page - 6
MQ442-01
8. Functional descriptions
8.1. Overview of Functions
1) Clock functions
This function is used to set and read out month, date, day, hour, minute, and second.
Any (two-digit) year that is a multiple of 4 is treated as a leap year and calculated automatically as such until the year
2099.
For details, see "8.2. Description of Registers".
2) Clock precision adjustment function
The clock precision can be adjusted forward or back in units of
± 3.05 × 106. This function can be used to implement
a higher-precision clock function, such as by:
enabling higher clock precision throughout the year by taking seasonal clock precision adjustments into account in
advance, or
enabling correction of temperature-related clock precision variation in systems that include a temperature detection
function.
Note: Only the clock precision can be adjusted. The adjustments have no effect on the 32.768-kHz output from the
FOUT pin.
For details, see "8.3. Clock Precision Adjustment Function".
3) Periodic interrupt function
In addition to the alarm function, Periodic interrupts can be output via the /INT pin.
Select among five Periodic frequency settings: 2 Hz, 1 Hz, 1/60 Hz, hourly, or monthly.
Select among two output waveforms for periodic interrupts: an ordinary pulse waveform (2 Hz or 1 Hz) or a waveform
(every second, minute, hour, or month) for CPU-level interrupts that can support CPU interrupts.
A polling function is also provided to enable monitoring of pin states via registers.
For details, see "8.4. Periodic Interrupt Function".
4) Alarm functions
This module is equipped with two alarm functions (Alarm W and Alarm D) that output interrupt signals to the host at
preset times. The Alarm W function can be used for day, hour, and minute-based alarm settings, and it outputs
interrupt signals via the /INT pin. Multiple day settings can be selected (such as Monday, Wednesday, Friday,
Saturday, and Sunday). The Alarm D function can be used only for hour or minute-based settings, and it outputs
interrupt signals via the /INT pin.
A polling function is also provided to enable checking of each alarm mode by the host.
For details on the Alarm W function, see "8.5. Alarm W function" and for the Alarm D function, see "8.6. Alarm D Function".
5) Oscillation stop detection function, power drop detection function (voltage monitoring function), and
power-on reset detection function
The oscillation stop detection function uses registers to record when oscillation has stopped.
The power drop detection function (supply voltage monitoring function) uses registers to record when the supply
voltage drops below a specified voltage threshold value. Use registers to specify either of two voltage threshold
values: 2.1 V or 1.3 V. Voltage sampling is performed once per second in consideration of the module's low current
consumption.
While the oscillation stop detection function is useful for determining when clock data has become invalid, the supply
voltage monitoring function is useful for determining whether or not the clock data is able to become invalid. The
supply voltage monitoring function can also be used to monitor a battery's supply voltage.
When these functions are utilized in combination with the power-on reset detection function, they are useful for
determining whether clock data is valid or invalid when checking for power-on from 0 V or for back-up.
For details, see "8.7. Detection Functions".
6) Interface with CPU
The RX-4045 is connected to the CPU by four signal lines CE (Chip Enable), CLK (Clock), DI (Data Input),
and DO (Data Output),through which it reads and writes data from and to the CPU.
The CPU can be accessed when the CE pin is held high.Access clock pulses have a maximum frequency of 1 MHz
allowing high-speed data transfer to the CPU.
For further description of data read/write operations, see "8.9. Read/Write of data ".
7) 32.768-kHz clock output
The 32.768-kHz clock (with precision equal to that of the built-in quartz oscillator) can be output via the FOUT pin.
Note: The precision of this 32.768-kHz clock output via the FOUT pin cannot be adjusted (even when using the clock
precision adjustment function).
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