M16C65 Datasheet, PDF (455/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
20. Real-Time Clock
Time and day change
TSTART bit
in RTCCR1 register = 0
TCSTF bit in
RTCCR1 register = 0?
0
RTCTIC register ← 00h
RTCCIC register ← 00h
Stop real-time clock operation
(not necessary while count is stopped
or in compare 3 mode)
1
Disable real-time clock periodic interrupt
Disable real-time clock compare interrupt
Setting of RTCCSR register
Setting of H12H24 bit
in RTCCR1 register
Select clock source
Set a.m./p.m. operating mode
Setting of registers RTCSEC,
RTCMIN, RTCHR,and RTCWK
Setting of RTCPM bit
in RTCCR1 register
NG
Confirmation of RTCPM bit
in RTCCR1 register and
registers RTCSEC, RTCMIN,
RTCHR, and RTCWK
Set second, minute, hour, day, a.m./p.m.⁽¹⁾
OK
Setting of RTCCR2 register
Setting of registeres RTCTIC and RTCCIC
(IR bit ← 0, select interrupt priority level)
TSTART bit
in RTCCR1 register = 1
Select interrupt source
Start real-time clock operation
TCSTF bit in
0
RTCCR1 register = 1?
1
End
Note:
1. One cycle of the count source is sometimes necessary to write a correct value after compare match.
Figure 20.5 Time and Day Change Procedure (Compare 2 Mode or Compare 3 Mode)
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
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