Circuit Description
Real Time Clock
minutes, seconds, year, month, and day.
A battery maintains operation when power is off.
This circuit receives clock pulses from an external
can up-track years, beginning with
crystal, which it divides into hours,
KHz
BIT
6 B I T
SECONDS
BUSY FLAG CLEAR
BUSY
4 BIT
5 BIT
MONTHS
YEARS
I
I
LEAP YEAR
DECODER
D R I V E R
Figure
Block Diagram
Print Control
The
and
signals
serial
print data to the
latches
serial
print data to the
from a shift register through
enable
printing in four
sequential intervals.
This system has a
printing format and
determines
High/Low enable status
according to the
signal.
A
Data
D
C
I
I
D
C
Shift
I
Figure
Printer Timing
Electronics
Содержание SF11OT
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