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f
OSC1
RFRUNR register
Time base counter
Measurement counter clock
Measurement counter
OVTBC, IRFB
Interrupt request
Note: • When the R/f converter interrupt is generated, be sure to check whether or not the R/f conversion
has completed normally by reading the overflow flags.
• When an interrupt occurs by the counter overflow, the same interrupt will occur if the overflow flag
(OVMC or OVTBC) is not reset. Be sure to check and reset to "0" (writing "1") the overflow flag
when the R/f converter interrupt occurs.
S1C63666 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (R/f Converter)
Count-down
0
FFFFFH FFFFEH FFFFDH
FFFFCH FFFFBH
n
n+1
n+2
n+3
Fig. 4.15.4.4 Time base counter overflow interrupt
EPSON
Oscillation by reference resistance
Overflow
3
2
1
0
m-2
m-1
m(≠0)
Undefined
117
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