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| 型號： | M30100 |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單片16位CMOS微機(jī) |
| 文件頁數(shù)： | 33/164頁 |
| 文件大小： | 3302K |
| 代理商： | M30100 |
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Oscillation Stop Detection
deveopment
Tentative Specifications REV.E1
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M30100/M30102 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
32
Oscillation stop detection bit (CM20)
You can start the oscillation stop detection by setting this bit to "1" and CM21=1 (oscillation stop detection
interrupt enabled). 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. Set
this bit to "0" also before setting the main clock stop bit (bit 5 at 0006
16
) to "1".
Do not set this bit to "1" if the frequency of X
IN
is lower than 2 MHz.
An oscillation stop is detected if CM02=“1” (peripheral function clock has been set for stop in wait mode)
and the mode is shifted to wait.
Oscillation stop detection interrupt enable bit (CM21)
When CM20=1 and CM21=1, an oscillation stop detection interrupt is generated if an abnormal stop of
X
IN
is detected. The ring oscillator starts operation instead of the X
IN
clock which stopped abnormally.
The operation goes further with the main clock supplied from the ring oscillator. For the oscillation stop
detection interrupt, judgment on the interrupt condition is necessary, because this interrupt shares the
vector table with watchdog timer interrupt. Figure 1.10.3 shows flow of the judgment with oscillation stop
detection interrupt processing program.
Main clock switch bit (CM22)
When setting this bit to "1", the ring oscillator is selected as main clock. At this time, the ring oscillator
starts simultaneously if it has been stopped (CM14=1). This bit is cleared only when CM23 is "0" (when
X
IN
is oscillating).
If an oscillation stop is detected while both CM20 and CM21 are “1”, this bit automatically switches to “1”.
When this bit is set to “1”, the ring oscillation stop bit (bit 4 of address 0007
16
) is automatically set to “0”.
Clock monitor bit (CM23)
You can see the operation status of the X
IN
clock. When this bit is "0", X
IN
is operating correctly. You can
check the oscillation status of X
IN
when an oscillation stop detection interrupt is generated or after reset.
When oscillation stop detection is invalid (CM20=“0”), the clock monitor bit is “0”.
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