MSM6782-01 Просмотр технического описания (PDF) - Oki Electric Industry

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MSM6782-01

Real time clock

Oki Electric Industry 

¡ Semiconductor

MSM6782-01

FUNCTIONAL DESCRIPTION OF REGISTERS

Registers S1, S10, MI1, MI10, H1, H10, D1, D10, MO1, MO10, Y1, Y10, W

• These are abbreviations for Second1, Second10, MInute1, MInute10, Hour1, Hour10, Day1,

Day10, MOnth1, MOnth10, Year1, Year10, Week.

These values are in BCD notation.

• Refer to the REGISTER TABLE for more detalied information.

All registers are logically positive.

For example, (S8, S4, S2, S1) = 1001 means 9 seconds.

The * bit in the register table is writable/readable and can be used as RAM.

• Writing non-existant data may cause a clocking error.

• PM/AM, h20, h10

a) In 12-hour mode

The existant time is AM 12:00 through AM 11:00 and PM 12:00 through PM 11:00.

It is impossble to write data into the h20 bit which is fixed to “0” unconditionally. The h20

bit is not set by clocking.

b) In 24-hour mode

The existant time is 0:00 clock through 23:00 clock.

The PM/AM bit written is ignored and read out as “0” unconditionally.

• Registers Y1, Y10, and Leap Year

When using the Christian Era calendar, Y1 and Y10 are assigned to the last 2 digits of the year

of Christian Era.

The MSM6782 - 01 is capable of automatically identifying a leap year when the last 2-digit

number of the year can be divided by four. The last 2-digit number 99 changes to 00 next year.

• Register W

The count range of the register W is 0 ~ 6. The following table shows a possible bit data

definition.

W4 W2 W1 Day of Week

0 0 0 Sunday

0 0 1 Monday

0 1 0 Tuesday

0 1 1 Wednesday

1 0 0 Thursday

1 0 1 Friday

1 1 0 Saturday

• fo Flag

The fo flag bit memorizes that oscillation stops and is used to monitor the output of the battery.

The “1” of this bit indicates stop of oscillation. This bit is cleared by writing “0”. It is not

permitted to write “1” into this bit.

127

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