S1C63653 TECHNICAL MANUAL
EPSON
95
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (R/f Converter)
RFRUNR: Reference oscillation RUN control/status (FF91HD1)
Starts R/f conversion for the reference resistance and indicates the operating (RUN/STOP) status.
When "1" is written: R/f conversion starts
When "0" is written: No operation
When "1" is read: RUN status
When "0" is read: STOP status
When "1" is written to RFRUNR, R/f conversion for the reference resistance starts. The register remains at
"1" during R/f conversion and is set to "0" when R/f conversion is terminated.
Writing "0" to RFRUNR is invalid.
At initial reset, this register is set to "0".
RFRUNS: Sensor oscillation RUN control/status (FF91HD0)
Starts R/f conversion for the sensor and indicates the operating (RUN/STOP) status.
When "1" is written: R/f conversion starts
When "0" is written: No operation
When "1" is read: RUN status
When "0" is read: STOP status
When "1" is written to RFRUNS, R/f conversion for the sensor starts. The register remains at "1" during
R/f conversion and is set to "0" when R/f conversion is terminated.
Writing "0" to RFRUNS is invalid.
At initial reset, this register is set to "0".
OVMC: Measurement counter overflow flag (FF91HD2)
Indicates whether the measurement counter has overflown.
When "1" is read: Overflow has occurred
When "0" is read: Overflow has not occurred
When "1" is written: Flag reset
When "0" is written: No operation
If an overflow occurs while counting the oscillation of the sensor, OVMC is set to "1" and the interrupt
occurs at the same time.
This flag is reset by writing "1" or starting R/f conversion.
At initial reset, this flag is set to "0".
OVTBC: Time base counter overflow flag (FF91HD3)
Indicates whether the time base counter has overflown.
When "1" is read: Overflow has occurred
When "0" is read: Overflow has not occurred
When "1" is written: Flag reset
When "0" is written: No operation
If an overflow occurs while counting the oscillation of the reference resistance, OVTBC is set to "1" and
the interrupt occurs at the same time.
This flag is reset by writing "1" or starting R/f conversion.
At initial reset, this flag is set to "0".