UPD78F0411GA-GAM-AX Datasheet, PDF (275/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 9 REAL-TIME COUNTER
(13) Watch error correction register (SUBCUD)
This register is used to correct the count value of the sub-count register (RSUBC).
SUBCUD can be set by an 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 9-14. Format of Watch Error Correction Register (SUBCUD)
Address: FF82H After reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
SUBCUD
DEV
F6
F5
F4
F3
F2
F1
F0
DEV
0
1
Setting of watch error correction timing
Corrects watch error when the second digits are at 00, 20, or 40.
Corrects watch error only when the second digits are at 00.
F6
Setting of watch error correction method
0
Increases by {(F5, F4, F3, F2, F1, F0) – 1} × 2.
1
Decreases by {(/F5, /F4, /F3, /F2, /F1, /F0) + 1} × 2.
When (F6, F5, F4, F3, F2, F1, F0) = (*, 0, 0, 0, 0, 0, *), the watch error is not corrected.
/F5 to /F0 are the inverted values of the corresponding bits (000011 when 111100).
(14) Alarm minute register (ALARMWM)
This register is used to set minutes of alarm.
ALARMWM can be set by an 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Caution Set a decimal value of 00 to 59 to this register in BCD code. If a value outside the range is
set, the alarm is not detected.
Figure 9-15. Format of Alarm Minute Register (ALARMWM)
Address: FF86H After reset: 00H R/W
Symbol
7
6
ALARMWM
0
WM40
5
WM20
4
WM10
3
WM8
2
WM4
1
WM2
0
WM1
User’s Manual U18698EJ1V0UD
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