NJU6355 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJU6355

SERIAL I/O REAL TIME CLOCK

Japan Radio Corporation  

NJU6355

2. Timer Data Reading

When the I/O termianl is "L" and the CE tarminal is "H", timer data can read out. The output is LSB first and the

output data strings is shown below.

The timer data is transferred from timer counter to shift register at rising edge of the chip enable on the CE

terminal, and output the LSB of the timer data from the DATA terminal.

Afterward the timer data in the shift register shift by synchronized at the falling edge of clock signal on the CLK

terminal and output from the DATA terminal.

If the timer data is updated in the data output, there are one second difference between timer data and output

data.

Type E

Year

Month

Day

Days of

Week

Hour

Minute Second

The data is read out from LSB of Year, and first 52-bit is effective.

If the low voltage detector detect the low battery, (EE)H is written into each digit of timer data and read out. The

code of (EE)H is a warning for the broken.

< Read Out Timing >

CLK

CE

I/O

Data

Output

Shift

Register

01 2 3 4 5 6 7

Year

01 2 3 4 5 6 7

34567

Second

3 4 56 7

(1) (2)

The timer data is transferred to the shift register at rising edge of the CE (1)

and LSB of the timer data is output to the DATA terminal. Afterward the

timer data in the shift register shift by synchronized at falling edge of the

CLK(2) then output to the DATA terminal time-to-time.

Note) When the CE signal is which rising edge or falling edge,

the CLK signal should be fixed to “L”. And so, before the

CE signal is raised, the I/O signal should be fixed to “L”.

-3-

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