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H8/3003 Datasheet(PDF) 186 Page - Renesas Technology Corp

Part # H8/3003
Description  microcontroller (MCU)
PDF  715 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3003 Datasheet(HTML) 186 Page - Renesas Technology Corp

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Contention between RTCOR Write and Compare Match: If a compare match occurs in the T3
state of an RTCOR write cycle, writing takes priority and the compare match signal is inhibited.
See figure 7-22.
Figure 7-22 Contention between RTCOR Write and Compare Match
RTCNT Operation at Internal Clock Source Switchover: Switching internal clock sources may
cause RTCNT to increment, depending on the switchover timing. Table 7-9 shows the relation
between the time of the switchover (by writing to bits CKS2 to CKS0) and the operation of
RTCNT.
The RTCNT input clock is generated from the internal clock source by detecting the falling edge
of the internal clock. If a switchover is made from a high clock source to a low clock source, as in
case No. 3 in table 7-9, the switchover will be regarded as a falling edge, an RTCNT clock pulse
will be generated, and RTCNT will be incremented.
T1
T2
T3
RTCOR address
NM
N
N + 1
ø
Address
RTCNT
RTCOR
RTCOR write cycle by CPU
Internal
write signal
Compare
match signal
Inhibited
RTCOR write data
168



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