S1C63656 TECHNICAL MANUAL
EPSON
167
APPENDIX PERIPHERAL CIRCUIT BOARDS FOR S1C63656
<R/f converter>
- If the debugger breaks executing of the target program while the R/f converter is counting the
oscillation, the R/f converter stops counting. Note that the R/f converter will not able to load a
proper result if the count operation is resumed from that point.
- The signal polarity of the R/f converter oscillation frequency output (RFOUT) is inverted. RFOUT of
the S5U1C63658P2 is active High and that of the actual IC is active Low. Pay attention when using
the output signal for a purpose other than measurement of the oscillation frequency.
- The following shows the oscillation characteristics (reference value) of the R/f converter on the
S5U1C63658P2:
R/f converter oscillation frequency - capacitance characteristic (reference value)
Capacitance [pF]
Oscillation frequency [Hz]
470
1,000
2,200
4,700
1,000,000
100,000
10,000
1,000
100
10
1
R = 50 k
Ω
R/f converter oscillation frequency - resistance characteristic (reference value)
Resistance [k
Ω
]
Oscillation frequency [Hz]
1
10
100
1,000
1,000,000
100,000
10,000
1,000
100
10
1
C = 1000 pF