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MSC1210

¡ Semiconductor

FEDL1210-03

• Display Mode

4-digit display of hours/minutes on a 12-hour format.

Hours display ............. between 1 and 12

Minutes display .......... between 00 and 59

The most significant digit will not appear if it is zero. (Most significant digit zero suppress

mechanism)

• Correcting Clock

Hour/minute fast advance function.

Hour digits and minute digits can fast advance, separately.

The hour digit can fast advance via HS pin (Hour Set), and the minute digit via MS pin (Minute

Set) with 2 Hz period.

The hour counter or minute counter is incremented by 1 each time of pressing.

If keeping it depressed, these counters are incremented continuously with 2 Hz intervals.

The HS and MS pins, when they are open, are kept at "1" level with a pull-up resistor, and

become non-active.

These pins become active when "0" level voltage is supplied from the external source.

The hour digit and minute digit can fast advance simultaneously.

In doing the fast advance operation, the low order digit of the counter continues a normal

operation, but a carry out of the minute digit into the hour digit does not occur.

In doing the minute digit fast advance, a carry into the hour digit does not occur.

• Zero Adjust Function (

±30 minutes Zero Reset)

The ZA pin (Zero Adjust), when it is open, is kept at "1" level thith a pull-up resisitor, and

becomes non-active.

This pin becomes active when "0" level voltage is supplied from the external source in order

to execute Zero Adjust operation.

If the minute digits are smaller than 30, the minute digits and second digits are reset to 00'00".

If the minute digits are larger than 30, the minute digits and second digits are reset to 00'00",

and a carry into the hour digit is executed.

Pre-second resetting of the counter is performed up to 16 Hz.

(Zero Adjust Example)

(X – 1) (hour) 30'00"

X (hour) 00'00"

X (hour) 00'00"

X (hour) 29'59"

X (hour) 30'00"

X (hour) 59'59"

(X + 1) (hour) 00'00"

(X + 1) (hour) 29'59"