m30262f8gp Renesas Electronics Corporation., m30262f8gp Datasheet - Page 42
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m30262f8gp
Manufacturer Part Number
m30262f8gp
Description
Renesas 16-bit Cmos Single-chip Microcomputer M16c Family / M16c/20 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.M30262F8GP.pdf
(239 pages)
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Oscillation Stop Detection
36
Oscillation stop detection bit (CM20)
Main clock switch bit (CM21)
Oscillation stop detection status (CM22)
Clock monitor bit (CM23)
Operation select (when an oscillation stop is detected) bit (CM27)
You can start the oscillation stop detection by setting this bit to “1”. The detection is not executed when
this bit is set to “0” or in reset status. Be sure to set this bit to “0” before setting for the stop-mode. Set this
bit again to “1” after release from stop-mode. This is because it is necessary to cancel the oscillation stop
detection function due to a certain period of unstable oscillation after release from stop-mode. Set this bit
to “0” also before setting the main clock stop bit (bit 5 at 0006
Do not set this bit to “1” if the frequency of X
You can use the ring oscillator as a system clock by setting this bit to “1”. When this bit is "0", the ring
oscillator is not in operation. For more explanation, see the section of the clock generating circuit.
You can see the status of the oscillation stop detection. When this bit is “1”, an oscillation stop is de-
tected. For usage of this bit, see the explanation on CM27.
You can see the operation status of the X
check the operation status of X
(1) Operation when internal reset is selected (CM27 is set to “0”.)
(2) Operation when oscillation stop detection interrupt is selected (CM27 is set to “1”.)
An internal reset is generated when an abnormal stop of X
reset status and does not operate further.
Note: Release from this status is only possible through an external reset. However, in case of a
All ports are configured to input port (floating) after an internal reset is generated.
An oscillation stop detection interrupt is generated when an abnormal stop of X
oscillator starts operation instead of the X
with the supply from the ring oscillator. For the oscillation stop detection interrupt judgement on the
interrupt condition is necessary, because this interrupt shares the vector table with watchdog timer inter-
rupt. Use the oscillation stop detection status (CM22) for the judgment. By clearing CM22, the accep-
tance of oscillation stop detection interrupt resumes. Figure 1.8.7 shows the flow of the judgment.
Preliminary Specifications Rev. 0.9
defect X
Specifications in this manual are tentative and subject to change.
IN
clock, further operation cannot be compensated.
IN
when an oscillation stop detection interrupt is generated.
Renesas Technology Corp.
IN
clock. When this bit is “0”, X
IN
IN
clock which stopped abnormally. The operation goes further
is lower than 2 MHz.
IN
16
) to “1”.
is detected. The microcomputer stops in
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
IN
is operating correctly. You can
IN
is detected. The ring
M16C/26 Group
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