S1C63666 TECHNICAL MANUAL
EPSON
117
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (R/f Converter)
n
0
FFFFCH FFFFBH
n+1
n+2
n+3
m-2
m-1
m(
≠
0)
Undefined
3
2
1
0
FFFFFH FFFFEH FFFFDH
Overflow
Oscillation by reference resistance
f
OSC1
RFRUNR register
Time base counter
Measurement counter clock
Measurement counter
OVTBC, IRFB
Interrupt request
Count-down
Fig. 4.15.4.4 Time base counter overflow interrupt
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.