M30280F6HP RENESAS [Renesas Technology Corp], M30280F6HP Datasheet - Page 83
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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7.7 System Clock Protective Function
7.8 Oscillation Stop and Re-oscillation Detect Function
e
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Table 7.6 Specification Overview of Oscillation Stop and Re-oscillation Detect Function
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When the main clock is selected for the CPU clock source, this function protects the clock from modifica-
tions in order to prevent the CPU clock from becoming halted by run-away.
If the PM21 bit in the PM2 register is set to “1” (clock modification disabled), the following bits are protected
against writes:
Before the system clock protective function can be used, the following register settings must be made while
the CM05 bit in the CM0 register is “0” (main clock oscillating) and CM07 bit is “0” (main clock selected for
the CPU clock source):
(1) Set the PRC1 bit in the PRCR register to “1” (enable writes to PM2 register).
(2) Set the PM21 bit in the PM2 register to “1” (disable clock modification).
(3) Set the PRC1 bit in the PRCR register to “0” (disable writes to PM2 register).
Do not execute the WAIT instruction when the PM21 bit is “1”.
The oscillation stop and re-oscillation detect function detects the re-oscillation after stop of main clock
oscillation circuit. When the oscillation stop and re-oscillation detection occurs, the oscillation stop detect
function is reset or oscillation stop and re-oscillation detection interrupt is generated, depending on the
CM27 bit set in the CM2 register. The oscillation stop detect function is enabled or disabled by the CM20 bit
in the CM2 register. Table 7.6 lists a specification overview of the oscillation stop and re-oscillation detect
function.
Oscillation stop detectable clock and
frequency bandwidth
Enabling condition for oscillation stop,
re-oscillation detection function
Operation at oscillation stop,
re-oscillation detection
C
2
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• CM02, CM05, and CM07 bits in CM0 register
• CM10, CM11 bits in CM1 register
• CM20 bit in CM2 register
• All bits in PLC0 register
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Set CM20 bit to “1”(enable)
•Reset occurs (when CM27 bit is set to "0")
•Oscillation stop, re-oscillation detection interrupt occurs(when
CM27 bit is set to "1")
IN
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2 MHz
Specification
7. Clock Generation Circuit
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