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R01UH0336EJ0102 Rev.1.02
Page 273 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 7 Clock Generation
(2)
Indication of Abnormal Clock Frequency
f
CLMAnTMON
too high
f
CLMAnTMON
exceeding the upper threshold indicates clock abnormalities as
follows:
1. The reset request signal CLMAnRES (active low) is being output.
2. The peripheral reset signal PERRES is being generated and is resetting
CLMAn.
Figure 7-5
Indication of Clock Abnormality when f
CLMAnTMON
Rises above the Upper
Threshold
f
CLMAnTMON
too low
The response by CLMAn to f
CLMAnTMON
falling below the lower threshold is
described by the entry in the table that corresponds to the current setting of
CLMAnCTL1.CLMAnOSEL
Figure 7-6
Indication of Clock Abnormality when f
CLMAnTMON
Falls below the Lower
Threshold (when CLMAnCTL1.CLMAnOSEL = 1)
CLMAnTI
CLMAnTERR
CLMAnRES
PERRES
(2)
(1)
Table 7-15
When f
CLMAnTMON
is too Low
CLMAnCTL1.
CLMAnOSEL
Indication of Clock Abnormality when f
CLMAnTMON
Falls
below the Upper Threshold
0
CLMAn outputs a reset-request signal (CLMAnRES: active low).
This is the same response as when f
CLMAnTMON
is too high; see
the description above.
1
CLMAn outputs an error signal (CLMAnTERR: active high) and
generates an error-interrupt request (CLMAnTI).
•
The error signal (CLMAnTERR) is set to the high level and
remains there until CLMAn is reset (PERRES).
•
The error-interrupt request (CLMATI) is only generated once,
even if the clock frequency remains too low.
CLMAnTI
CLMAnTERR
CLMAnRES
PERRES