Datasheet

Table Of Contents
Rev. 2.00 Jul. 04, 2007 Page 680 of 692
REJ09B0309-0200
Item Page Revisions (See Manual for Details)
Modified
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 φ
w
/4 is selected, the RTC is disabled and
operates as an 8-bit free running counter.
Bit Bit Name Description
3
2
1
0
RCS3
RCS2
RCS1
RCS0
Clock Source Selection
0000: φ/8⋅⋅⋅⋅⋅⋅⋅⋅Free running counter operation
0001: φ/32⋅⋅⋅⋅⋅⋅Free running counter operation
0010: φ/128⋅⋅⋅⋅Free running counter operation
0011: φ/256⋅⋅⋅⋅Free running counter operation
0100: φ/512⋅⋅⋅⋅Free running counter operation
0101: φ/2048⋅⋅Free running counter operation
0110: φ/4096⋅⋅Free running counter operation
0111: φ/8192⋅⋅Free running counter operation
1000 : φ
w
/4⋅⋅⋅⋅⋅RTC operation
1001 to 1111: Setting prohibited
Section 10 Realtime Clock
(RTC)
10.3.7 Clock Source Select
Register (RTCCSR)
220
10.4.1 Initial Settings of
Registers after Power-On
222 Modified
The RTC registers that store second, minute, hour, and day-of-
week data, control registers, and interrupt registers are not
initialized by a RES input, or by a reset source caused by a
watchdog timer.
10.5 Interrupt Sources 224 Modified
When using an interrupt, set the IENRTC (RTC interrupt
request enable) bit in IENR1 to 1 last after other registers are set.
10.6.2 Note when Using RTC
Interrupts
225 This section is newly added.
Section 11 Timer C
11.1 Features
227 Modified
Up/down-counter switching is selected either by the register
specification or the external input level specification.