M30280F6HP RENESAS [Renesas Technology Corp], M30280F6HP Datasheet - Page 85

• Manufacturer Part Number: M30280F6HP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

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Figure 7.13 Switching Procedure from On-chip Oscillator to Main Clock
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7.8.3 How to Use Oscillation Stop and Re-oscillation Detect Function
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• The oscillation stop and re-oscillation detect interrupt shares the vector with the watchdog timer inter-
• Where the main clock re-oscillated after oscillation stop, return the main clock to the CPU clock and
• Simultaneously with oscillation stop, re-oscillation detection interrupt occurrence, the CM22 bit be
• If the main clock stops during low speed mode where the CM20 bit is “1”, an oscillation stop, re-oscilla-
• To enter wait mode while using the oscillation stop, re-oscillation detection function, set the CM02 bit to
• Since the oscillation stop, re-oscillation detection function is provided in preparation for main clock stop
• This function cannot be used if the main clock frequency is 2 MHz or less. In that case, set the CM20 bit
0 .
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tion detection interrupt request is generated. At the same time, the on-chip oscillator starts oscillating. In
rupt. If the oscillation stop, re-oscillation detection and watchdog timer interrupts both are used, read
the CM22 bit in an interrupt routine to determine which interrupt source is requesting the interrupt.
peripheral function clock source in the program. Figure 7.13 shows the procedure for switching the
clock source from the on-chip oscillator to the main clock.
comes “1”. When the CM22 bit is set at “1”, oscillation stop, re-oscillation detection interrupt are dis-
abled. By setting the CM22 bit to “0” in the program, oscillation stop, re-oscillation detection interrupt
are enabled.
this case, although the CPU clock is derived from the sub clock as it was before the interrupt occurred,
the peripheral function clocks now are derived from the on-chip oscillator clock.
“0” (peripheral function clocks not turned off during wait mode).
due to external factors, set the CM20 bit to “0” (Oscillation stop, re-oscillation detection function dis
abled) where the main clock is stopped or oscillated in the program, that is where the stop mode is
selected or the CM05 bit is altered.
to “0”.
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NOTES:
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1. If the clock source for CPU clock is to be changed to PLL clock, set to PLL operation
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mode after set to high-speed mode.
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page 65
No
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("oscillatin stop, re-oscillation" not detected)
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Determine several times whether
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(main clock or PLL clock)
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Switch to the main clock
Set the CM06 bit to "1"
Set the CM22 bit to "0"
Set the CM21 bit to "0"
) B
the CM23 bit is set to "0"
8
(main clock oscillates)
(divide-by-8 mode)
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End
Yes
CM06 bit : Bit in the CM0 Register
CM23 to CM21 bits : Bits in the CM2 Register
7. Clock Generation Circuit