Chapter 27 Real Time Clock - Fujitsu F2MC-8FX Hardware Manual

CHAPTER 27 REAL TIME CLOCK

Block Diagram of Real time Clock
Frequency Fine-tuning
Register (FFTR)
Second Register (SECR)
Minute Register (MINR)
Minute Compare Register (MICR)
Hour Register (HOUR)
Hour Compare Register (HRCR)
Day of the Week Register (DOWR)
Day Register (DAYR)
Day Compare Register (DYCR)
Month Register (MONR)
Month Compare Register (MOCR)
Year Register (YEAR)
Prescaler
This counter serves as to generate one-second ticks to the real time clock.
Second Counter
This counter is used to count the real time "second".
Minute Counter
The counter is used to count the real time "Minute".
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Figure 27.2-1 Block Diagram of Real Time Clock
Auto Calibration Control Register (CALCR)
CALUF CALOF CALCP CALIRQ
0 1 2 3
CALPL
Auto-calibration
control circuit
Second Counter
Minute Counter
Comparator
Hour Counter
Comparator
DoW Counter
Day Counter
Comparator
Month Counter
Comparator
Year Counter
Real Ti m e Clo ck Block Diagram
CALEN CT0 CT1 -
4 5 6 7
Counter segment
1 Hz
selector control
64 Hz
1024 Hz
Prescaler
SUBCLK
1/10 Hz
RTC Control Register Lower (RTCCRL)
PAU CL PS - INTS
7 6 5 4
RTC Control Register Upper (RTCCRH)
MOS DS HS MS MOC
7 6 5 4 3
Interrupt Sharing Control
IRQ11
Day count
and
leap year
logic
4-1
TPCLK
Selector
S2 S1 OE
3 2 1 0
DC HC MC
2 1 0