16 R/F COnVeRTeR
S1C63003/004/008/016 TeChniCal Manual
Seiko epson Corporation
16-7
(Rev. 1.1)
n
0
FFFFCH FFFFBH
n+1
n+2
n+3
FFFFD FFFFEH FFFFFH
0
x+3
x+2
x+1
x
FFFFFH FFFFEH FFFFDH
Oscillation by reference resistance
R/F converter clock
RFRUNR register
Time base counter
Measurement counter clock
Measurement counter
IRFR
Interrupt request
Count-down
5.1 Reference oscillate completion interrupt
Figure 16.
0
x
x+4
x+5
1
2
3
m-3
m-2
m-1
m
FFFFEH FFFFFH
0
x+1
x+2
Oscillation by sensor resistance
R/F converter clock
RFRUNS register
Time base counter
Measurement counter clock
Measurement counter
IRFS
Interrupt request
Count-up
x+3
5.2 Sensor oscillate completion interrupt
Figure 16.
0
x
x+4
x+5
1
2
3
FFFFDH FFFFEH FFFFFH
0
y-2
y-1
y
x+1
x+2
Oscillation by sensor resistance
R/F converter clock
RFRUNS register
Time base counter
Measurement counter clock
Measurement counter
IRFE, OVMC
Interrupt request
Count-up
x+3
Overflow
5.3 Error interrupt due to measurement counter overflow
Figure 16.
n
0
FFFFCH FFFFBH
n+1
n+2
n+3
m-2
m-1
m(
≠
0) Undefined
3
2
1
0
FFFFFH FFFFEH
Oscillation by reference resistance
R/F converter clock
RFRUNR register
Time base counter
Measurement counter clock
Measurement counter
IRFE, OVTC
Interrupt request
Count-down
FFFFDH
Overflow
5.4 Error interrupt due to time base counter overflow
Figure 16.
Note: When an error interrupt occurs, reset the overflow flag (OVMC or OVTC) by writing "1." The same
error interrupt will occur again if the overflow flag is not reset.