M30280F6HP RENESAS [Renesas Technology Corp], M30280F6HP Datasheet - Page 84
M30280F6HP
Manufacturer Part Number
M30280F6HP
Description
16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.M30280F6HP.pdf
(423 pages)
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7.8.1 Operation when CM27 bit is set to "0" (Oscillation Stop Detection Reset)
7.8.2 Operation when CM27 bit is set to "1" (Oscillation Stop and Re-oscillation Detect
Interrupt)
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When main clock stop is detected when the CM20 bit is “1” (oscillation stop, re-oscillation detection
function enabled), the microcomputer is initialized, coming to a halt (oscillation stop reset; refer to 4. SFR
and 5. Reset).
This status is reset with hardware reset 1 or hardware reset 2. Also, even when re-oscillation is detected,
the microcomputer can be initialized and stopped; it is, however, necessary to avoid such usage. (During
main clock stop, do not set the CM20 bit to “1” and the CM27 bit to “0”.)
When the main clock corresponds to the CPU clock source and the CM20 bit is “1” (oscillation stop and
re-oscillation detect function enabled), the system is placed in the following state if the main clock comes
to a halt:
When the PLL clock corresponds to the CPU clock source and the CM20 bit is “1”, the system is placed
in the following state if the main clock comes to a halt: Since the CM21 bit remains unchanged, set it to “1”
(on-chip oscillator clock) inside the interrupt routine.
When the CM20 bit is set to "1", the system is placed in the following state if the main clock re-oscillates
from the stop condition:
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• Oscillation stop and re-oscillation detect interrupt request occurs.
• The on-chip oscillator starts oscillation, and the on-chip oscillator clock becomes the CPU clock and
• CM21 bit is set to "1" (on-chip oscillator clock for CPU clock source)
• CM22 bit is set to "1" (main clock stop detected)
• CM23 bit is set to "1" (main clock stopped)
• Oscillation stop and re-oscillation detect interrupt request occurs.
• CM22 bit is set to "1" (main clock stop detected)
• CM23 bit is set to "1" (main clock stopped)
• CM21 bit remains unchanged
• Oscillation stop and re-oscillation detect interrupt request occurs.
• CM22 bit is set to "1" (main clock re-oscillation detected)
• CM23 bit is set to "0" (main clock oscillation)
• CM21 bit remains unchanged
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clock source for peripheral functions in place of the main clock.
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page 64
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7. Clock Generation Circuit
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