UPD78F0411GA-GAM-AX Datasheet, PDF (267/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 9 REAL-TIME COUNTER
Figure 9-3. Format of Real-Time Counter Control Register 0 (RTCC0)
Address: FF89H After reset: 00H R/W
Symbol
<7>
6
<5>
<4>
3
2
1
0
RTCC0
RTCE
0
RCLOE1 RCLOE0
AMPM
CT2
CT1
CT0
RTCE
0
1
Stops counter operation.
Starts counter operation.
Real-time counter operation control
RCLOE1
0
1
RTC1HZ pin output control
Disables output of RTC1HZ pin (1 Hz).
Enables output of RTC1HZ pin (1 Hz).
RCLOE0^Note
RTCCL pin output control
0
Disables output of RTCCL pin (32.768 kHz).
1
Enables output of RTCCL pin (32.768 kHz).
AMPM
Selection of 12-/24-hour system
0
12-hour system (a.m. and p.m. are displayed.)
1
24-hour system
• To change the value of AMPM, set RWAIT (bit 0 of RTCC1) to 1, and re-set the hour count register (HOUR).
• Table 9-2 shows the displayed time digits that are displayed.
CT2
CT1
CT0
Constant-period interrupt (INTRTC) selection
0
0
0
Does not use constant-period interrupt function.
0
0
1
Once per 0.5 s (synchronized with second count up)
0
1
0
Once per 1 s (same time as second count up)
0
1
1
Once per 1 m (second 00 of every minute)
1
0
0
Once per 1 hour (minute 00 and second 00 of every hour)
1
0
1
Once per 1 day (hour 00, minute 00, and second 00 of every day)
1
1
×
Once per 1 month (Day 1, hour 00 a.m., minute 00, and second 00 of
every month)
After changing the values of CT2 to CT0, clear the interrupt request flag.
Note RCLOE0 and RCLOE2 must not be enabled at the same time.
Caution If RCLOE0 and RCLOE1 are changed when RTCE = 1, a pulse with a narrow width may be
generated on the 32.768 kHz and 1 Hz output signals.
Remark ×: don’t care
User’s Manual U18698EJ1V0UD
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