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HD64F3687HV Datasheet, PDF (183/538 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series | |||
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Section 10 Realtime Clock (RTC)
10.3.7 Clock Source Select Register (RTCCSR)
RTCCSR selects clock source. A free running counter controls start/stop of counter operation by
the RUN bit in RTCCR1. When a clock other than 32.768 kHz is selected, the RTC is disabled
and operates as an 8-bit free running counter. When the RTC operates as an 8-bit free running
counter, RSECDR enables counter values to be read. An interrupt can be generated by setting 1 to
the FOIE bit in RTCCR2 and enabling an overflow interrupt of the free running counter. A clock
in which the system clock is divided by 32, 16, 8, or 4 is output in active or sleep mode.
Initial
Bit
Bit Name Value
7
â
0
6
RCS6
0
5
RCS5
0
4
â
0
3
RCS3
1
2
RCS2
0
1
RCS1
0
0
RCS0
0
Legend: X: Don't care.
R/W
â
R/W
R/W
â
R/W
R/W
R/W
R/W
Description
Reserved
This bit is always read as 0.
Clock output selection
Selects a clock output from the TMOW pin when setting
TMOW in PMR1 to 1.
00: Ï/4
01: Ï/8
10: Ï/16
11: Ï/32
Reserved
This bit is always read as 0.
Clock source selection
0000: Ï/8â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
Free running counter operation
0001: Ï/32â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
â
Free running counter operation
0010: Ï/128â
â
â
â
â
â
â
â
â
â
â
â
â
â
Free running counter operation
0011: Ï/256â
â
â
â
â
â
â
â
â
â
â
â
â
â
Free running counter operation
0100: Ï/512â
â
â
â
â
â
â
â
â
â
â
â
â
â
Free running counter operation
0101: Ï/2048â
â
â
â
â
â
â
â
â
â
â
â
Free running counter operation
0110: Ï/4096â
â
â
â
â
â
â
â
â
â
â
â
Free running counter operation
0111: Ï/8192â
â
â
â
â
â
â
â
â
â
â
â
Free running counter operation
1XXX: 32.768 kHzâ
â
â
â
â
RTC operation
Rev.5.00 Nov. 02, 2005 Page 149 of 500
REJ09B0027-0500
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