UPD4992CX 查看數據表（PDF） - NEC => Renesas Technology

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UPD4992CX

8-Bit Parallel I/O Calendar Clock

NEC => Renesas Technology 

TP OUTPUT (mode register: TP output mode)

1/f

µPD4992

50 % duty continuous output

BUSY SIGNAL

Internal counter

1 Hz

Busy

signal output

1s carry over

1s carry over

457.7 µs

30.5 µ s

TP output

DISABLE set

BUSY flag

ON

BUSY flag

OFF

BUSY flag

ON

The time and calendar data read out when BUSY signal is being output may not be correct. This is because, the

internal time counter is operating. Therefore, accessing must be disabled during this period or the data must be read

out twice and checked by the software. (Reading data during BUSY period has not effect on the contents of the internal

counter.)

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